File: RELEASE_NOTES

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amavisd-new 1:2.11.0-6.1
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---------------------------------------------------------------------------
                                                             April 26, 2016
amavisd-new-2.11.0 release notes

Contents:
  DEPRECATION NOTICE
  COMPATIBILITY
  BUG FIXES
  NEW FEATURES
  OTHER
  SUPERVISED PROCESS NOTES


DEPRECATION NOTICE

- The old DomainKey signatures (a predecessor to DKIM) has been published
  as a historic document RFC 4870 and obsoleted by RFC 4871 in May 2007;
  Support for DomainKey signatures is likely to be removed with a next
  version of amavisd.

- It is expected that the next release of amavisd will start using some
  of the features made available with perl 5.10.0 (such as a defined-or
  operator, or a possessive quantifier in regular expressions), so
  consider running amavisd under perl 5.8.9 or earlier as unsupported.
  In practice, using such old version of perl is problematic even now,
  as their support for Unicode / UTF-8 is incomplete and unreliable.


COMPATIBILITY

There are some minor incompatibilities between versions 2.10.1 and 2.11.0:

- During startup more detailed testing is performed for taint bugs of
  a module Encode and the function utf8::is_utf8(), which may produce
  warnings on old versions of perl with its old core module Encode,
  or may exit on detecting more sinister bugs in these modules.
  Note that the module Encode may be upgraded independently of perl,
  if desired;

- with MySQL: changed character set 'utf8' to 'utf8mb4' for fields
  msgs.subject and msgs.from_addr, as previously some of the UTF-8
  characters could not be stored in a database;

- when logging to stderr a timestamp prefix to each message is only
  still inserted if $DEBUG is true.  When $DEBUG is false each message
  is prefixed with a syslog log level in angle brackets, and a timestamp
  is omitted (for compatibility with systemd);

- a perl module Digest::SHA is now a required module. It is a perl core
  module since perl 5.10, so it shouldn't introduce a new dependency,
  and it was a de-facto required module even previously, as it was needed
  for DKIM processing;


BUG FIXES

- delivery method was undefined when always_bcc was used;
  reported by Marieke Janssen;

- avoid warnings issued by perl 5.21.7 and later:
    Negative repeat count does nothing at ./amavisd line 16408
  and similarly in amavisd-status;

- releasing from an SQL quarantine failed to provide the original
  envelope sender address to a released message;
  reported, and a fix suggested by Tom Johnson and Tobias;

- remove a stale database file __db.nanny.db on a reload or restart,
  as it can prevent a successful start when a previous start failed
  for some reason; a patch by Trent Lloyd;


NEW FEATURES

- Polished rough corners to facilitate running amavisd as a non-daemonized
  supervised process, e.g. under systemd:

  * make it possible/easier to disable use of a pid_file;

  * send status notifications to systemd when a NOTIFY_SOCKET environment
    variable is provided;

  * improved logging to stderr when $do_syslog and $logfile are undefined
    (although logging through syslog might still be preferred, as writing
    to a shared pipe from multiple child processes only guarantees atomicity
    of writes shorter than PIPE_BUF, which is typically 512 bytes on *BSD,
    and 4096 bytes on Linux systems);

  See below for a sample amavisd.service file.

- A log template macro 'report_json' can now take arguments, which can
  include or exclude fields (key/values) from the JSON report object.
  Arguments to a macro are either field names (keys) to be included
  in a report, or are field names to be excluded, each prefixed with
  an exclamation mark, to produce a report with all but excluded fields.

  Field names are case-sensitive. The order of fields in a serialized
  JSON object is unaffected by the order of field names in a filter.
  Unknown or non-present field names in a filter are silently ignored.

  Example:
    [:report_json|mail_id|action|content_type|queued_as|mail_from|size]
  or:
    [:report_json|!recipients|!elapsed|!os_fp|!subject|!subject_rot13]

  For better clarity, instead of listing field names as individual
  arguments to a macro, it is also possible to provide a single argument
  to a macro, in which field names are separated by whitespace:
    [:report_json|mail_id action content_type queued_as mail_from size]
  or:
    [:report_json|  !message !recipients !to_addr   !elapsed !os_fp
       !subject !subject_rot13 !user_agent !tests !tests_ham !tests_spam]

  As an example, a setting in a config file may look like:
    $log_templ = '[:report_json|mail_id action queued_as mail_from]';

  If at least one field name has an exclamation mark (i.e. is to be
  excluded), all but excluded fields are implied, so any field names
  without an exclamation mark are redundant.

  Currently this is a simple filter where subfields of a structured
  object cannot be selectively filtered (e.g. elapsed.SpamCheck).
  For finer control on JSON content use some external JSON-processing
  utility.  Based on a patch by Markus Benning.

- Two new configuration settings are added: %smtpd_tls_server_options
  and %smtp_tls_client_options. These two associative arrays are passed
  to IO::Socket::SSL->start_SSL when establishing a server-side or a
  client-side TLS session with an MTA, and provide more control over
  a TLS session - like providing certificates and restricting ciphers.
  See documentation of a perl module IO::Socket::SSL for a list of
  all options with their descriptions and their defaults.

  When TLS is in use, it is recommended to stick to fresh versions
  of the module IO::Socket::SSL and the underlying ssl library,
  as it can provide a safer set of defaults (e.g. excluded SSLv2).

  Existing config options $smtpd_tls_cert_file and $smtpd_tls_key_file
  are now deprecated in favour of a more generic %smtpd_tls_server_options.
  Preferably set fields 'SSL_key_file' and 'SSL_cert_file' directly in
  %smtpd_tls_server_options instead. For compatibility with 2.10 the
  values of $smtpd_tls_cert_file and $smtpd_tls_key_file are fed into
  the associative array %smtpd_tls_server_options if fields 'SSL_key_file'
  and 'SSL_cert_file' are not provided (do not exist) there.

  Example:

  %smtp_tls_client_options = (
    SSL_verifycn_scheme => 'smtp',
    SSL_version => '!SSLv2,!SSLv3',
    SSL_cipher_list => 'HIGH:!MD5:!DSS:!aNULL',
#   SSL_client_ca_file => ... ,
  );

  %smtpd_tls_server_options = (
    SSL_verifycn_scheme => 'smtp',
    SSL_session_cache => 2,
    SSL_key_file  => "$MYHOME/cert/amavisd-key.pem",
    SSL_cert_file => "$MYHOME/cert/amavisd-cert.pem",
    SSL_dh_file   => "$MYHOME/cert/amavisd-dh.dat",
  # SSL_ca_file   => ... ,
    SSL_version   => '!SSLv2,!SSLv3',
    SSL_cipher_list => 'HIGH:!MD5:!DSS:!aNULL',
  );

  Or just to change some field and leave the rest at their default:

    $smtp_tls_client_options{SSL_verify_mode} = 0;  # SSL_VERIFY_NONE

  Suggested by Marc Grooz and Patrick Ben Koetter, based on a patch
  by Markus Benning.

- Supports receiving SMTP/LMTP connections through a HAProxy,
  recognizing 'PROXY protocol Version 1' data on the first line read,
  after a connection from HAProxy to amavisd has been established.
  Connection data (IP addresses and ports) received via this protocol
  end up replacing such data in the the Amavis::In::Connection object
  ($conn).  Set configuration variable $haproxy_target_enabled (also
  a member of policy banks) to true in order to enable this protocol.

- redis: allow a scoped / link-local IP address specification
  (avoiding current limitation in IO::Socket::IP [rt.cpan.org #89608]);

- the Amavis::Unpackers::Part::digest method now holds a digest (SHA1,
  hex) of a decoded (base64 or quoted-printable) MIME part contents,
  followed by a colon and a lowercased Content-Type of the MIME part.
  Canonical line endings CRLF in decoded textual parts are normalized
  to a native newline (\n) before feeding them to a digest algorithm.

  These digests are passed to SpamAssassin through a 'mimepart_digests'
  supplementary attribute, and are available to custom hooks. As of
  version SpamAssassin 3.4.1, these are used as additional tokens in
  a Bayes plugin. Even though SpamAssassin is capable of computing
  the same or similar digests on its own, the advantage of computing
  them in amavisd is that they reflect all and completely unmodified
  and untruncated MIME parts of a mail message, including non-textual
  attachments.

  For debugging, search the log for "mimepart digest: ", logged at
  log level 5, and ".* Content-Type: .*, size:" at log level 2.
  Based on a suggestion by Andreas Schulze back in 2014.

  A configuration setting $mail_part_digest_algorithm was added, which
  chooses an algorithm name for generating digests of decoded MIME
  parts of a message. The value is an algorithm name as accepted by
  Digest::SHA->new(), e.g. 'sha1' or 'SHA-1' or 'SHA-256' or 'sha256',
  or a string 'MD5' (case-insensitive) which chooses the MD5 algorithm
  as implemented by a module Digest::MD5. An undefined value disables
  generating digests of MIME parts. The $mail_part_digest_algorithm
  setting is a dynamic setting, i.e. it is a member of policy banks.

  For compatibility with SpamAssassin the chosen algorithm should be
  SHA1 (which is a default), otherwise bayes tokens won't match those
  generated by sa-learn (which is typically used for off-line learning).
  Bayes auto-learning in SpamAssassin is unaffected by a mismatch of
  the algorithm, as it believes digests received from amavisd.

- Policy bank names in a @client_ipaddr_policy setting can now accept
  a comma-separated list of policy names to be loaded on a match
  (for loading of policy banks based on an IP address of a SMTP client).
  Whitespace around each policy name is allowed and is stripped.
  Previously only a single policy bank name was allowed in each entry
  of @client_ipaddr_policy.

  This makes it consistent with loading of policy banks based on a
  DKIM-based setting @author_to_policy_bank_maps, and on virus checker
  results via the @virus_name_to_policy_bank_maps setting.

- Experimental feature: IP lookups (as implemented by lookup_ip_acl()
  and used by @client_ipaddr_policy) can now also do DNS-based lookups,
  in addition to array- and hash- based lookups.
  Suggested by Patrick Ben Koetter and loosely based on his patch.

  DNS lookups follow RFC 5782 conventions (DNS Blacklists and Whitelists:
  DNSBL, DNSWL, collectively known as DNSxL).  A DNS query of a type 'A'
  is performed on a reversed IP address prepended to a specified domain
  name (zone name).  RFC 5782 suggests that only type-A resource records
  of a DNS reply in an address range 127.0.0.0/8 may be considered.

  For example, given a zone name 'rbl.example.org' and a SMTP client's
  IP address 198.51.100.12, a DNS type-A query for a domain name
  "12.100.51.198.rbl.example.org" would be sent to a specified or to a
  default DNS resolver or server. Similarly, an IP address 2001:db8::2:f
  would produce a DNS type-A query for a domain name "f.0.0.0.2.0.0.0.0.
  0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.b.d.0.1.0.0.2.rbl.example.org" .

  The setting @client_ipaddr_policy contains a list of pairs, each pair
  consisting of a lookup object (arrayref or hashref, or now also an
  Amavis::Lookup::DNSxL object), followed by a policy bank name (which
  is a string: one or more policy bank names, comma-separated).

  The object constructor Amavis::Lookup::DNSxL->new accepts as its
  arguments: a dns zone name, expected result(s) for a match, and a
  resolver object. Only the first argument (a DNSxL zone name) is
  required, the remaining two arguments are optional. A default
  expected result is '127.0.0.2', and a default Net::DNS::Resolver
  persistent object is provided implicitly if not provided by a caller
  (it reads a DNS resolver's IP address from /etc/resolv.conf).

  The "expected result(s) for a match" argument (the second argument)
  is compared to the address found in a DNS reply (in a 127.0.0.0/8 range).
  It can be:
  a) an integer between 0 and 255 (or a string representing such
    integer), which is used to match the last byte on the 127.0.0.x quad;
  b) a string in a dotted-quad form of an IPv4 address in a 127.0.0.0/8
    range, where leading bytes may be omitted (e.g. '1.8' == '127.0.1.8');
  c) a reference to an array consisting of entries in an (a) or (b) form,
     where a match with any of the array elements suffices for a match;
  d) a perl regular expression object (e.g.  qr{^127\.[3-8]\.0\.\d*$} ).

  If an IP address in a DNS reply matches the provided "expected result"
  argument, the policy banks associated with that entry are loaded,
  and a search through a @client_ipaddr_policy list stops.

  As a shorthand a subroutine Amavis::Conf::q_dns_a() is provided,
  which is just a convenient wrapper for Amavis::Lookup::DNSxL->new().

  Example:

  @client_ipaddr_policy = (
    [qw( 0.0.0.0/8 127.0.0.0/8 [::] [::1] )] => 'MYNETS, LOCALHOST',
    [qw( 169.254.0.0/16 [fe80::]/10 )]       => 'MYNETS, LINKLOCAL',
    [qw( 10.0.0.0/8 172.16.0.0/12 192.168.0.0/16 )] => 'MYNETS, PRIVATENET',
    \@mynetworks => 'MYNETS',
    q_dns_a('rbl.example.org')           => 'MY-CUSTOMER-A',    # 127.0.0.2
    q_dns_a('rbl.example.org', 3) => 'MYNETS,MY-CUSTOMER-B',    # 127.0.0.3
    q_dns_a('rbl.example.org', '0.2.99') => 'MY-CUSTOMER-C',    # 127.0.2.99
    q_dns_a('rbl.example.org', '127.0.0.7') => 'MY-CUSTOMER-D', # 127.0.0.7
    q_dns_a('rbl.example.org', qr/^127\.1\.\d+\.2\d*\z/) =>'X', # 127.1.*.2*
    q_dns_a('rbl.example.org', '192.0.2.0.2')=>'never matches', # not in 127/8
  );

  Below is an example of an amavisd.conf section with an explicitly
  provided Net::DNS::Resolver object, which offers finer control over
  its settings:

  use Net::DNS;
  my $dnsxl_res = Net::DNS::Resolver->new(
    config_file => '/etc/resolv.conf',
    port => 5333, retry => 1, persistent_udp => 1,
    tcp_timeout => 2, udp_timeout => 2, retrans => 1,
  );
  $dnsxl_res or die "Module Net::DNS not available for DNSxL usage";
  $dnsxl_res->udppacketsize(1220);

  my $myrbl = 'rbl.example.org';

  @client_ipaddr_policy = (
    \@mynetworks => 'MYNETS',
    q_dns_a($myrbl, 2,       $dnsxl_res) => 'MY-CUSTOMER-A',  # 127.0.0.2
    q_dns_a($myrbl, [3,4,5], $dnsxl_res) => 'MY-CUSTOMER-B',  # 127.0.0.{3,4,5}
  );

  This DNS-lookup feature is considered experimental in a sense that
  its API may change in future versions. As it is currently implemented,
  each q_dns_a() entry in a @client_ipaddr_policy results in its own
  DNS query, which is quite inefficient with more that one or two such
  entries. It would make more sense to do a single DNS lookup and provide
  some mapping between results returned and policy bank names to be
  loaded. Note also that DNS lookups are performed synchronously and
  sequentially (one at a time, one after another), so a slowly responding
  DNS server combined with multisecond timeouts and retries could severely
  bog down the amavisd response time, easily to exceed the time a MTA or
  a SMTP client is willing to wait for a response. YOU HAVE BEEN WARNED!


OTHER

- Relax a check on a PID number found in a pid file, considering
  that amavisd may run as PID #1 under Docker; reported by Imre Rad.

- Relax a check on $pid_file being configured or provided by a command
  line option -P.  Amavisd can now run without checking or providing a
  PID file of a running master process, which is appropriate for running
  non-daemonized amavisd as a supervised process (e.g. under supervision
  suites such as systemd, s6, nosh, runit, launchd or similar).  Also,
  specifying a command line option -P '' (i.e. giving it an empty name
  of a pid_file) overrides a configuration option $pid_file and is a
  quick way to disable usage of a pid_file.

  A default value of $pid_file is now only provided if a global
  setting $daemonize is true (which is a default, unless running
  with 'foreground' or 'debug' command line options).
  A non-daemonized amavisd leaves $pid_file undefined as a default,
  which facilitates running amavisd as a supervised process, e.g.
    $daemonize = $pid_file = $daemon_user = undef;

  When a pid_file is disabled and running under systemd, amavisd obtains
  a PID of a master process from systemd through environment variable
  MAINPID, which allows operations like 'amavisd reload' and 'amavisd stop'
  from a .service file  (ExecReload and ExecStop in systemd.exec(5)).

  Btw, a command line argument 'foreground' is a quick way to override
  a configuration setting $daemonize - it sets its value to 0.

  To let amavisd provide and use a PID file even when not daemonized,
  configure a PID file explicitly, e.g.: $pid_file = "$MYHOME/amavisd.pid";


- provide sensible diagnostics when $daemon_user is undefined and
  starting as root;

- 'sanitize_nul' function is now enabled by default (this is currently
  not configurable). Null octets found in a message are replaced by a
  pair of octets \xC0 \x80, which is a "Modified UTF-8" encoding of a
  NUL. This is done to avoid a mailbox server (like Cyrus) or a mail
  client on choking on such mail. The downside is that such sanitation
  can invalidate a DKIM signature - but non-encoded NUL octets are not
  allowed in mail anyway, so not much harm is done;

- overhauled a client side of the ClamAV clamd protocol;

- updated decoder for 7z archives to improve handling of encrypted
  content; based on a patch by Markus Benning;

- recognize and handle completely encrypted zip archives by 7z
  (in do_7zip); a patch provided by Thomas Jarosch;

- adjusted log levels of some log/debug messages;

- reject a message with an 8BITMIME body type if a back-end MTA does
  not announce 8bit-MIMEtransport capability in its EHLO response
    ( 550 5.6.3 Conversion to 7BIT required but not supported );

- replaced calls to Encode::is_utf8() by utf8::is_utf8() - less buggy
  in old versions of perl, but requires perl 5.8.1 or later;

- replaced calls to Encode::encode_utf8() by utf8::encode() - is
  much faster, and is less buggy in old versions of perl;

- more detailed testing for taint bugs of a module Encode and in
  utf8::is_utf8() during startup;

- decode a supposedly (or guessably) character set ISO-8859-1 as
  Windows-1252, which is a proper superset of ISO-8859-1 and often
  mistaken for ISO-8859-1; (this follows advice of HTML5);

- with MySQL: changed character set 'utf8' to 'utf8mb4' for fields
  msgs.subject and msgs.from_addr;

- in case the Net::Server receives a connection over a Unix socket
  (e.g. from amavisd-release) but is unable to determine a socket name,
  supply a dummy socket name 'UNKNOWN' so that a policy bank 'SOCK'
  can still be loaded;

- the setting $mail_digest_algorithm is now a dynamic setting, i.e.
  can be configured per policy bank. The change makes it consistent
  with a new setting $mail_part_digest_algorithm, which is also dynamic;

- updated the @av_scanners Avast entry ( http://www.avast.com/ )
  in the sample config file amavisd.conf to a new version
  of their scanner:
    ['avast! Antivirus', '/bin/scan', '{}', [0], [1], qr/\t(.+)/m]
  Thanks to Martin Tůma from Avast for the new entry;

- updated a default @$map_full_type_to_short_type_re to distinguish
  encrypted PGP/GnuPG files from other PGP/GnuPG containers like
  a detached signature, exported public key files, etc., if a
  newer version of a file(1) utility is in use (5.20?);

- relaxed the  /\bscript\b.* text executable\b/  regexp entry in the
  default @$map_full_type_to_short_type_re list so that a mail part
  such as qualified by a file(1) utility as:
    Python script, Non-ISO extended-ASCII text executable
  does not qualify as an executable; reported by Tilman Schmidt;

- updated a default @$map_full_type_to_short_type_re to recognize
  a Microsoft Word document as type doc; thanks to Jörg Backschues;

- added PhishTank.Phishing to a default @virus_name_to_spam_score_maps;

- reworded some notification texts;


SUPERVISED PROCESS NOTES

Socket activation (running under a superserver with fd-holding) is
currently not available. Note that 'amavisd reload' does fd-holding
and socket passing to a new incarnation of amavisd server on its own,
which means that a client (an MTA) does not see a disruption on a
reload (= warm restart), unlike in case of restarting amavisd.

As a reminder: a full restart is only necessary when changing the set
of listening sockets in a configuration file. For all other needs
(like changing other settings, updating SpamAssassin rules, upgrading
the amavisd program, or perl modules, or perl itself) a reload suffices.

Here is a sample file amavisd.service for use under systemd
(indented for clarity).  Lightly tested on Debian 8.0 (Jessie)
on a Raspberry Pi.

/lib/systemd/system/amavisd.service

  [Unit]
  Description=amavisd-new mail filter
  Before=shutdown.target
  After=systemd-journald-dev-log.socket network-online.target local-fs.target
  Wants=network-online.target
  Conflicts=shutdown.target

  [Service]
  Type=notify
  NotifyAccess=main
  KillMode=mixed
  TimeoutStartSec=1min
  TimeoutStopSec=3min
  User=amavis
  Group=amavis
  WorkingDirectory=/var/lib/amavis/tmp
  StandardOutput=syslog
  SyslogFacility=mail
  SyslogIdentifier=amavis
  ProtectSystem=full
  ProtectHome=yes
  NoNewPrivileges=yes
  ExecStart  = /usr/sbin/amavisd-new -P '' foreground
  ExecReload = /usr/sbin/amavisd-new -P '' reload
  ExecStop   = /usr/sbin/amavisd-new -P '' stop

  [Install]
  WantedBy = multi-user.target


Consider the following amavisd.conf settings when running as a
supervised process:

  $pid_file = '';  # can be overridden by a command line option -P ''
  $daemonize = 0;  # also implied by a command line argument 'foreground'
  $do_syslog = 0;  # or set it to 1 to log to syslog instead of stderr


---------------------------------------------------------------------------
                                                           October 25, 2014
amavisd-new-2.10.1 release notes

Contents:
  COMPATIBILITY
  BUG FIXES
  OTHER


COMPATIBILITY

There are no incompatibilities between versions 2.10.0 and 2.10.1.


BUG FIXES

- fixed a missing import of mail_addr_idn_to_ascii() and idn_to_utf8()
  when SQL is in use, resulting in:
    Undefined subroutine &Amavis::Out::SQL::Log::mail_addr_idn_to_ascii
    Undefined subroutine &Amavis::Out::SQL::Log::idn_to_utf8
  reported by Jim Knuth;


OTHER

- avoid warnings issued by perl 5.21.5:
    Negative repeat count does nothing at ./amavisd line 17218
    Missing argument in sprintf at ./amavisd line 3678

- updated documentation in 2.10.0 release notes (new macros);


---------------------------------------------------------------------------
                                                           October 22, 2014
amavisd-new-2.10.0 release notes

Contents:
  COMPATIBILITY
  BUG FIXES
  NEW FEATURES
  OTHER


COMPATIBILITY

- New requirement: perl module Net::LibIDN needs to be installed.

- Uses a perl module File::LibMagic if installed, instead of spawning
  a file(1) utility.

- Support for international email relies heavily on perl to do the
  right thing in its support of Unicode, so using a reasonably recent
  version of perl is recommended. Amavisd was tested with perl 5.18
  and 5.20.1.  Versions of perl older than 5.12 may cause problems
  with handling, encoding, and decoding of Unicode characters.
  It is reasonable to expect that versions 5.14 and 5.16 are fine too,
  but have not been tested extensively.

- Default log templates and notification templates have changed
  in details (like in decoding of international e-mail addresses), so
  if locally customized templates are in use these will benefit from
  updating - otherwise expect some mojibake in log and notifications.

- International domain names (IDN) encoded in ASCII-compatible encoding
  found in e-mail addresses and in Message-ID header field will be decoded
  to Unicode for presentation purposes (syslog, JSON structured log,
  notifications). This decoding does not affect a mail message itself.

- Logging via syslog expects that syslogd (or equivalent) will not
  clobber UTF-8 octets. It may be necessary to tell syslogd to accept
  C1 control characters unchanged, e.g. by adding a command line option
  "-8" to syslogd. Failing to do so may leave logged entries (like
  sender and recipient address, From, Subject) in international mail
  garbled or poorly readable in syslog.
  On FreeBSD one should add:  syslogd_flags="-8"  to /etc/rc.conf.

- Third party log parsers may need updating to accept logs with Unicode
  characters in UTF-8 encoding.

- A SMTP response to an EHLO command will now announce SMTPUTF8 capability
  by default.


BUG FIXES

- releasing a message from an SQL quarantine was broken in version
  2.9.1 due to introduction of parent_mail_id(); patches provided by
  Stef Simoens and Gionatan Danti;

- if checking of a message was aborted prematurely (like due to a
  timeout or some fatal error), JSON log could receive a copy of a
  previous log entry;

- prevent non-ASCII non-UTF-8 octets from reaching a JSON log/report
  (which produced an invalid JSON object and Elasticsearch complaining);

- allow SMTP commands MAIL FROM and RCPT TO to accept options without
  values, as allowed by the RFC 5321 syntax;

- in delivery status notification (DSN) the field Received-From-MTA
  specified 'smtp' as mta-name-type, instead of a 'dns' as prescribed
  in RFC 3464;

- releasing from a quarantine left envelope sender address as '<>'
  instead of using the address found in a Return-Path header field
  of a quarantined message, while also logging a warning:
    Quarantine release $QID: missing X-Envelope-From or Return-Path
  reported by Pascal Volk;

- avoid failure in os_fingerprint or in smtp forwarding in certain cases
  where the $os_fingerprint_method or $forward_method or $notify_method
  uses an asterisk in place of a host IP address or port number.
  The reported error in os_fingerprint (reported by -ben) was:
    os_fingerprint FAILED: Insecure dependency in socket
      while running with -T switch
      at /usr/lib/perl/5.18/IO/Socket.pm line 80
  and in SMTP forwarding or notification (reported by Dennis Boone):
    (!)connect to *:10025 attempt #1:
      Insecure dependency in socket while running with -T switch
      at /usr/lib/perl/5.18/IO/Socket.pm line 80.

- files LDAP.ldif and LDAP.schema: added a missing attribute
  amavisDisclaimerOptions to objectClass; reported by Quanah Gibson-Mount;


NEW FEATURES

- added support for Internationalized Email:
  * RFC 6530 - Overview and Framework for Internationalized Email
  * RFC 6531 - SMTP Extension for Internationalized Email (SMTPUTF8)
  * RFC 6532 - Internationalized Email Headers
  * RFC 6533 - Internationalized Delivery Status Notifications

  This supports UTF-8 (EAI) in SMTP/LMTP sender addresses, recipient
  addresses, and message header section. Feature parity with Postfix
  version 2.12 (support introduced in development snapshot 20140715).

  The SMTPUTF8 extension is supported by Gmail since 2014-08-05:
    http://googleblog.blogspot.com/2014/08/a-first-step-toward-more-global-email.html


- added support for Internationalized Domain Names (IDN) according
  to IDNA (RFC 5890, RFC 5891; RFC 3490);

  * A-labels in ASCII-compatible encoding of domain names are converted
    to U-labels for presentation/logging purposed;

  * U-labels are converted to A-labels when feeding a mail message
    to an MTA which does not announce support for SMTPUTF8 extension
    (instead of rejecting them as invalid mail address);

  * For lookup purposes an international domain name is converted to
    ASCII-compatible encoding when used as a query key in DNS lookups
    and in lookups into hash, list, SQL and LDAP lookup tables (but not
    in regexp table lookups). These tables are expected to contain domain
    names in their ASCII representation (ACE). For convenience of config
    files subroutines idn_to_ascii() and mail_idn_to_ascii() are available,
    which encode a Unicode domain name to ACE (like ToASCII in RFC 3490);

  * Many configuration settings may have their domain names in UTF-8.
    These will be converted to ACE automatically where necessary
    (e.g. when creating a Received and Authentication-Results header
    fields, DKIM signatures, mail addresses in notifications, ...).
    These settings include:

      $myhostname, $localhost_name, $myauthservid, $mydomain,
      notification sender and recipient mail addresses
        ($mailfrom_notify_*, $hdrfrom_notify_*, @*_admin_maps),
      domain names and selectors in DKIM signing keys (in calls
        to dkim_key() );


- delivery notifications and admin notifications now show the following
  information encoded as UTF-8 (which is a default $bdy_encoding) in the
  plain text part of the message: IDN domain names in sender and recipient
  mail addresses and Message-ID are first decoded to Unicode, Subject and
  author display names are MIME-decoded;

- 'amavisd showkeys' and 'amavisd testkeys' can now deal with IDN
  (international domain names): domain names in DNS zone comments
  end up as UTF-8, DNS labels are in ASCII (A-labels); domain names in
  calls to dkim_key() may be specified either as UTF-8 or in ASCII (ACE);

- new macro 'mail_addr_decode' takes an e-mail address as a string of
  octets, where a local part may be encoded as UTF-8, and the domain part
  may be an international domain name (IDN) consisting either of U-labels
  or A-labels or NR-LDH labels. Decodes A-labels to U-labels in domain
  name. Returns a string of logical characters (Unicode), suitable for
  notification templates. If the mail address is not a valid UTF-8 string,
  it is interpreted as ISO-8859-1 (Latin-1).

- new macro 'mail_addr_decode_octets' is like 'mail_addr_decode', except
  that the result is a string of octets, only valid as UTF-8 if the
  provided address was a valid UTF-8 (garbage-in/garbage-out);

- new macro 'header_field_octets' is like 'header_field', except that
  a result is a string of octets in UTF-8 encoding, suitable for a log
  template;

- new macro 'ip_proto_trace_all' expands into a list of information
  items from a Received header trace; each item consists of a protocol
  name (the WITH clause) and an IP address, optionally followed by a
  source port number if known;
  Example:
    ESMTP://[2001:db8::143:1]:39141 < ESMTP://2001:db8::25 <
      esmtps://203.0.113.172 < ESMTPSA://192.168.9.9
  or:
    UTF8SMTP://[203.0.113.172]:51208 < UTF8SMTPSA://192.168.9.9

- new macro 'ip_proto_trace_public' is like ip_proto_trace_all, except
  that entries with non-public IP address are excluded from the list;

  'Received' trace information in $log_verbose_templ and in notifications
  now include results from this macro call;

- new macro 'protocol' evaluates to a protocol name by which a message
  was received by amavisd, according to RFC 3848 ("Transmission Types
  Registration") and "Mail Transmission Types" / "WITH protocol types"
  IANA registration
    http://www.iana.org/assignments/mail-parameters/mail-parameters.xhtml
  e.g.: SMTP, ESMTP, ESMTPA, ESMTPS, ESMTPSA, LMTP, LMTPA, LMTPS, LMTPSA,
        UTF8SMTP, UTF8SMTPA, UTF8SMTPS, UTF8SMTPSA,
        UTF8LMTP, UTF8LMTPA, UTF8LMTPS, UTF8LMTPSA, ...

- new macro 'client_protocol' expands into a protocol name by which
  a message was received from a client by MTA; the information is passed
  from MTA to amavisd through XFORWARD PROTO SMTP protocol extension or
  through AM.PDP (milter); typical values are 'ESMTP' or 'SMTP';

- use a perl module File::LibMagic when available, instead of spawning
  a file(1) utility for classifying contents of mail parts.
  By using a direct interface to a libmagic library the startup cost
  of spawning an external process is avoided. Benchmarking shows that
  using libmagic is significantly faster especially for checking a small
  number of files - takes 4 ms for checking one file with libmagic
  vs. 27 ms with a spawned file(1); based on a patch by Markus Benning;


OTHER

- RFC 6533: recognize a MIME type 'message/global' as similar
  to 'message/rfc822', and 'message/global-headers' as similar
  to 'text/rfc822-headers' where appropriate (e.g. in bounce killer);

- header validity check now distinguishes 'non-ASCII and invalid UTF-8'
  from 'non-ASCII but valid UTF-8' characters in a mail header section.
  By default valid UTF-8 strings in a mail header section are not treated
  as error even if mail is not flagged as international mail (SMTPUTF8),
  as these are quite common in practice. To treat non- MIME-encoded UTF-8
  in a header section as error the test can be enabled by:
    $allowed_header_tests{'utf8'} = 1;

- ORCPT attribute in SMTP 'RCPT TO' command now accepts the original
  recipient mail address in any of these encodings: utf-8-address,
  utf-8-addr-unitext, utf-8-addr-xtext, or as a legacy xtext,
  as required by RFC 6533;

- updated do_cabextract (extraction of Microsoft cabinet .cab archives)
  to recognize a slightly changed output of cabextract version 1.2;
  patch by Thomas Jarosch;

- adjusted some timeouts to leave more reserve for later stages of
  mail processing and forwarding;

- prefer sanitizing/protecting control characters as hex code (like \x7F)
  instead of octal (like \177) (e.g. in logging and DSN);


---------------------------------------------------------------------------
                                                              June 27, 2014
amavisd-new-2.9.1 release notes

Contents:
  COMPATIBILITY
  BUG FIXES
  OTHER


COMPATIBILITY

There are no known incompatibilities between versions 2.9.0 and 2.9.1.


BUG FIXES

- when a $final_bad_header_destiny is set to D_BOUNCE and a mail
  message was a DSN or coming from a mailing list, spam checks were
  inappropriately skipped (logged as: "bypassing of spam checks,
  message will be blocked anyway", which was not true as the blocking
  was overruled at a later stage); reported by Bruce Pennypacker;

- perl 5.20.0 may occasionally report:
    "Malformed UTF-8 character (unexpected end of string)"
  due to a bug in perl [perl #122148].  Treat this error as non-fatal
  and only log a warning in two such cases: when SpamAssassin is called
  as a spawned subprocess ($sa_spawned=1) and is returning a result
  to a parent process, or when constructing a structured report.


OTHER

- updated decoding of RAR archives to recognize a changed format in output
  of 'unrar' utility version 5; based on a patch by amavis17(at)iotti.biz

- avoid tempfailing a message if a redis server is down, just log the
  error and carry on;

- some minor logging changes to facilitate troubleshooting;


---------------------------------------------------------------------------
                                                                May 9, 2014
amavisd-new-2.9.0 release notes

Contents:
  COMPATIBILITY
  NEW FEATURES SUMMARY
  RELAXED LICENSE
  BUG FIXES
  NEW FEATURES
  OTHER
  WHY REDIS?


COMPATIBILITY

This version drops dependency on a Perl module Redis, and makes
dependencies on modules Convert::TNEF and Convert::UUlib truly optional.

The following change may affect third-party log parsers:

To facilitate forensic log analysis and troubleshooting, log entries
'FWD from' and 'SEND from' at level 1 now carry one additional
prefixed information field which is the unique internal mail_id of
the message, possibly followed by a parent_mail_id in parenthesis,
e.g.:
  (00525-02) XE9xnQYjrWyd FWD from <...> -> <...>, ...
  (00495-02) v1pyIOMQkUYD(CIcqao-vCDO9) SEND from <...> -> <...>, ...

No other incompatibilities with a previous version 2.8.1 are expected.


NEW FEATURES SUMMARY

- structured log/reporting to a Redis server in JSON format;

- IP address reputation (uses a Redis server);

- added two minor content categories to the major ccat CC_UNCHECKED
  (encrypted (=1) and over-limits/mail-bomb (=2) );

- introduced a by-recipient setting %final_destiny_maps_by_ccat.


RELAXED LICENSE

Some utility / auxiliary programs that were previously released under a
3-clause BSD license, are now available under a more relaxed 2-clause BSD
license (also known as a "Simplified BSD License" or a "FreeBSD License").

Affected programs are: amavis-mc, amavis-services, amavisd-status,
amavisd-snmp-subagent-zmq, amavisd-release, amavisd-submit, p0f-analyzer.pl,
amavisd-nanny, amavisd-agent, amavisd-snmp-subagent, amavisd-signer,
JpegTester.pm, and TinyRedis.pm.

Note that TinyRedis.pm is provided in the package as a separate file
and includes a documentation section. Its copy is also included in
the file amavisd, so that the separate file is not needed for Amavis
operation. The separate copy is provided under a 2-clause BSD license
so that it may be useful for third parties if desired. Eventually it
could be moved to CPAN as an independent module.

A license of the main program 'amavisd' remains unchanged GPLv2.


BUG FIXES

- fixed "Insecure dependency in sprintf" in Sophos SAVI av-scanner,
  reported by Maciej Uhlig;

- fixed the interface code to virus scanners Sophie, Trophie and fpscand,
  where a time-out on a long-running virus scan would leave a connection
  to the virus scanner open and a late response from a scanner to a
  previous request could be interpreted as a result of the current scan;
  reported by David Schweikert;

- fixed a bug in transforming an IPv6 alternative form IP address into
  a preferred form. One effect of this bug was declaring an IPv4-mapped
  IPv6 address as syntactically incorrect; reported by Patrick Domack;

- if SQL logging was disabled a pen pals feature was non-functional even
  when a Redis storage back-end was available and collecting data; now
  pen pals is fully functional with a Redis database back-end and no SQL;

- provided our own Redis client code, avoiding Redis CPAN module bugs,
  its slowness and non-support for IPv6.
  The noteworthy Redis CPAN module bug is the #38 (failing to re-select
  a non-zero-index database after an automatic re-connect to a server).
  See: https://github.com/melo/perl-redis/issues/38
       https://github.com/melo/perl-redis/issues/28

- fixed a regexp in parsing wildcarded signing domain in a DKIM key
  declaration and in a wildcarded sender pattern of signing options
  (this feature is rarely used, exists for compatibility with dkim_milter);

- dropped hard-coded dependency on modules Convert::TNEF and Convert::UUlib.
  The Convert::TNEF was made optional in amavisd-new-2.8.0, but the
  program still failed if the module could not be loaded at startup.

  Both of these modules are now loaded at run time when first used, if
  specified in the @decoders setting. The use of module Convert::UUlib
  (the do_ascii entry) is disabled in a default setting of @decoders,
  and the module Convert::TNEF (the do_tnef entry) is not used
  if an external TNEF decoder (the do_tnef_ext entry) is available,
  or if disabled in the @decoders list;

- import a missing do_log_safe() in Amavis::LDAP::Connection to avoid
  a warning: _WARN: \t(in cleanup)
    Undefined subroutine &Amavis::LDAP::Connection::do_log_safe
    called at (eval 101) line 76 during global destruction;
  a patch by Quanah Gibson-Mount;

- at startup amavis may try to find a decoder for 7z and zip extensions
  twice; a fix by Quanah Gibson-Mount;

- fixed the amavisd-new-courier.patch which resulted in two instances
  of sub post_bind_hook(). Only tested for syntax. Thanks to Eray Aslan.


NEW FEATURES

- Structured logging/reporting in JSON format is now available through
  a redis server.

  Each processed mail message and each generated mail message (e.g.
  a delivery status notification) generates a structured data object
  (internally a perl associative array). Its fields carry information
  on most attributes of a mail message and its processing, similar
  to what is available for logging via macros. Unlike a plain text
  log which can be difficult to parse and inconsistent due to user
  configurability of the log template, the data object contains
  information in a structured form as key/value pairs, where each
  value can be a scalar or a list or an associative array.

  This internal data object is then serialized to a JSON format and
  sent to a redis server, where it is appended to a list under a key
  (arbitrary string) configured by $redis_logging_key setting. This
  list serves as a queue of log events, which may be pulled from the
  queue by some third party application, e.g. by a logstash utility
  or by some home-grown program. Redis server is quite handy for this
  purpose as it offers blocking requests for pulling events from a
  queue, which makes it easy to interface with an event processing
  program. The queue also allows for independent and asynchronous
  operation between amavisd child processes filling the queue, and
  a log analyzer pulling entries from the queue.

  The structured logging to redis is enabled when @storage_redis_dsn
  is configured (see below at the 'IP address reputation' section)
  and the setting $redis_logging_key is set to some nonempty and
  nonzero string, and the $redis_logging_queue_size_limit is set
  to some positive integer value (corresponding to a maximal number
  of entries allowed in a queue).

  Both the $redis_logging_key and $redis_logging_queue_size_limit are
  undefined by default, so structured logging to redis is disabled
  by default even if @storage_redis_dsn is configured.

  The string in $redis_logging_key determines the key in a redis
  database where the event queue (a redis list) will be maintained.
  Semantically it is a name of the queue. This setting is a component
  of policy banks, so log entries can be fed into different redis
  queues depending on a policy bank loaded for each mail message.

  To prevent a queue in the redis server from growing out of bounds,
  e.g. when an event-pulling program is temporarily nonfunctional or
  its processing is falling behind, the $redis_logging_queue_size_limit
  setting imposes a maximal number of events that amavisd may push into
  the queue, i.e. the maximal queue size. If the queue size limit is
  reached, new log events from amavisd are discarded as long as the
  queue size is at the limit. As a redis database is kept in memory, it
  makes sense to choose the value of $redis_logging_queue_size_limit low
  enough so that it does not use too much memory if the log processing
  program goes down, but also high enough so that short outages of
  the log processing program do not lose any log events. The setting
  $redis_logging_queue_size_limit is global (not a component of policy
  banks).

  And example setting:

    @storage_redis_dsn = ( { server => '[::1]:6379', db_id => 1 } );

    $redis_logging_queue_size_limit = 300000;
      # takes about 250 MB of redis memory per 100000 log entries

    $redis_logging_key = 'amavis-log';

    $policy_bank{'MYNETS'} = {
      originating => 1,
      redis_logging_key => 'amavis-log-myusers',  # overrides global setting
    }

  The oldest event may be pulled from listed queues by the redis command:
    BLPOP amavis-log amavis-log-myusers 0

  so from a command line this may look like:
    $ redis-cli -h ::1 -p 6379 -n 1
    BLPOP amavis-log 0

  The BLPOP redis command blocks if the queue is empty and only returns
  when the queue becomes nonempty, which makes it easy to use. For high
  event rates it may be more efficient to batch one LLEN and multiple
  BLPOP calls in a Lua script executed on a redis server and return events
  in chunks.

  An example of a logstash plugin configuration for pulling amavis log
  events from a redis server and feeding them to Elasticsearch:

  input {
    redis {
      type => "amavis"
      host => "::1"
      db => 1
      data_type => "list"
      key => "amavis-log"
      codec => json {}
    }
  }
  filter {
    date { match => [ "time_unix", "UNIX" ] }
  }
  output {
  # stdout { codec => rubydebug }
    elasticsearch_http {
      host => "127.0.0.1"
      port => 9200
      index_type  => "%{type}"
      document_id => "%{mail_id}"
      codec => json {}
    }
  }

  As an alternative for sending log events to a redis server, it is
  possible to use a macro [:report_json] in a log template, which will
  expand to a full JSON representation of a log event. As these strings
  are fairly long (typically 2 kB to 3 kB), this is not a good solution
  when logging to syslog. It may be usable when logging to a file, but
  is not an efficient solution and has not been tested in production.

  Here is a (fake) example of a structured log report entry in JSON
  format, fields are loosely ordered by their semantics in this example.
  Not all fields are always present. When a boolean fields is missing
  it should be interpreted as a false.

  {
    "@timestamp" => "2014-05-06T09:29:47.048Z",
    "time_unix" => 1399368587.048,
    "time_iso_week_date" => "2014-W19-2",
    "partition" => "19",

    "type" => "amavis",
    "host" => "mailer.example.net",
    "src_ip" => "::1",
    "dst_ip" => "::1",
    "dst_port" => 10024,

    "log_id" => "82329-04",
    "mail_id" => "Jnk7NzYB8pvl",
    "mail_id_related" => ["men7HTERZaOF"],

    "client_port" => 41831,
    "client_ip" => "2001:db8::143:1",
    "ip_trace" => ["2001:db8::143:1", "192.0.2.242"],
    "os_fp" => "Windows XP; dist: 6; raw_mtu: 1340; ...",

    "originating" => true,
    "policy_banks" => ["PROXY-ORIGINATING", "MYNETS"],

    "size" => 302694,
    "digest_body" => "a4a7db6307c140b12f57feaf076663f8",

    "mail_from" => "mailing-list-1@example.com",
    "rcpt_to" => ["recip2@example.org", "recip1@example.net"],
    "rcpt_num" => 2,

    "message_id" => "<003701cf690d$b671b3f0$23551bd0@example.com>",
    "author"  => ["sending-user@example.com"],
    "to_addr" => ["recip1@example.net"],
    "cc_addr" => ["recip2@example.org"],
    "subject"       => "Fw: An example 123 - test",
    "subject_rot13" => "Sj: Na rknzcyr 123 - grfg",
    "user_agent" => "Microsoft Office Outlook 12.0",
    "is_bulk"  => true,
    "is_mlist" => true,

    "action" => ["PASS"],
    "actions_performed" => "RelayedInternal RelayedOutbound",
    "checks_performed" => "V S H B F P",
    "content_type" => "Clean",
    "dkim_new_sig" => ["example.com"],
    "dsn_sent" => false,
    "elapsed" => { "Receiving"  => 0.009,
                   "Decoding"   => 0.053,
                   "VirusCheck" => 0.326
                   "SpamCheck"  => 2.116,
                   "Sending"    => 0.118,
                   "Amavis"     => 0.215,
                   "Total"      => 2.672,
                 },
    "message" =>
      "82329-04 PASS Clean <mailing-list-1@example.com>
         -> <recip2@example.org>,<recip1@example.net>",
    "queued_as" => ["3gNFyR4Mfjzc3", "3gNFyR4n6Lzc4"],
    "recipients" => [
      { "action" => "PASS",
        "ccat_main" => "Clean",
        "queued_as" => "3gNFyR4Mfjzc3",
        "rcpt_is_local" => false,
        "rcpt_to" => "recip2@example.org",
        "smtp_code" => "250",
        "smtp_response" => "250 2.0.0 from MTA(smtp:[::1]:10013): 250 2.0.0 Ok: queued as 3gNFyR4Mfjzc3",
        "spam_score" => -2.0
      },
      { "action" => "PASS",
        "ccat_main" => "Clean",
        "mail_id_related" => "men7HTERZaOF",
        "penpals_age" => 1114599,
        "queued_as" => "3gNFyR4n6Lzc4",
        "rcpt_is_local" => true,
        "rcpt_to" => "recip1@example.net",
        "smtp_code" => "250",
        "smtp_response" => "250 2.0.0 from MTA(smtp:[::1]:10013): 250 2.0.0 Ok: queued as 3gNFyR4n6Lzc4",
        "spam_score" => -5.272
      }
    ],
    "smtp_code"  => ["250"],
    "spam_score" => -2.0,
    "tests"      => ["ALL_TRUSTED", "AM.PENPAL", "BAYES_00",
                     "MSGID_MULTIPLE_AT", "RP_MATCHES_RCVD"],
    "tests_ham"  => ["AM.PENPAL","BAYES_00","ALL_TRUSTED","RP_MATCHES_RCVD"],
    "tests_spam" => ["MSGID_MULTIPLE_AT"],
  }


- IP address reputation

  When a Redis storage back-end is enabled, besides the existing pen pals
  functionality, it now also offers information updating and retrieval
  on IP address reputation. This function is enabled by default when
  @storage_redis_dsn is nonempty, but can be disabled by setting
  $enable_ip_repu to false (to 0 or undef), per policy bank if necessary.

  For each mail message a list of public IP addresses (IPv4 or IPv6) is
  collected from its 'Received' trace header fields in a mail header
  section. A redis server maintains a database of each IP address
  encountered. For each IP address an entry carries a set of counters
  corresponding to the number of mail messages encountered in the past
  having this IP address in a trace header. These counters show: a number
  of spam messages, a number of ham messages, a number of banned or
  infected messages, and a total number of messages. Also a timestamp of
  the first and last encounter is kept. Each entry (a set of counters)
  is subject to automatic expiry, so that infrequently encountered IP
  addresses are eventually automatically purged from a database by a
  redis server itself.

  As a sending IP address may change its role (e.g. some machine was
  infected (sending spam) but now has been cleaned, or a NAT-ted address
  is reassigned to someone else), currently a crude way of data aging is
  implemented by discarding entries older than three days since created.
  This may be refined in the future.

  When a new mail message is being processed, a lookup on all its public
  IP addresses from a trace is done. For each IP address found in a
  database a spam score is computed based on a ratio of ham versus
  all messages, and based on a total number of messages. The largest
  calculated spam score of all encountered IP addresses is then
  contributed to a total spam score of a message.

  A formula for computing spam score of each IP address is currently
  hard-coded, is non-linear and takes into account the total number of
  encounters of an IP address, diluted by the ratio of ham messages
  versus all messages seen with this IP address. The computed score
  cannot be negative, i.e. the IP reputation can only contribute to
  spamminess of a message and cannot serve as a 'whitelisting' negative
  score. For the exact formula in use see query_and_update_ip_reputation()
  in file amavisd.

  A time-to-live of each IP entry is assigned dynamically: frequently
  encountered IP addresses are given longer expiration times (days),
  infrequent IP addresses are short-lived and eventually expire,
  typically in few hours.

  It is possible to exclude certain IP addresses or networks from
  contributing spam score by listing them in an @ip_repu_ignore_networks
  list, e.g.:

    @ip_repu_ignore_networks =
      qw( 192.0.2.44 192.0.2.45 198.51.100.0/24 2001:db8::1:25 );

  This does not preclude a redis lookup on an IP addresses matching
  the list, but just takes a zero as its score and does not update
  counters on such address. The mechanism is appropriate for excluding
  site's own mailers (MSA and MX), or local (e.g. departmental) mailers,
  which may on occasion emit a spammy message, but should never receive
  a score penalty. There is no need to include private IP address networks
  in the list, as these are already exempt from IP reputation database.

  An associated list of lookup tables @ip_repu_ignore_maps (whose only
  default entry is the \@ip_repu_ignore_networks) offers more flexibility
  if needed, and is a member of policy banks.

  Like other self-learning mechanisms (e.g. SpamAssassin's auto-learn,
  AWL, TxRep), the quality of a result depends on a quality of other
  spam-gauging rules - the better spam/ham classification works
  (SpamAssassin), the more useful IP reputation becomes. For the purpose
  of IP reputation's spam and ham counts, a mail is considered spam if
  its score is at or above 5, and is considered ham when its final score
  is below 0.5. This is currently hard-coded (see sub save_info_final).
  Intermediate scores are considered unclassified.

  A nice feature of the mechanism is that it reacts fairly quickly
  to a new rush-in of unwanted messages from some IP address, either
  foreign, or local.

  For insight on the IP address reputation behaviour, search the log
  for ' redis: IP '. At log level 2 only spammy hits are logged, at
  log level 3 also the clean hits are shown. The log entry shows
  spam, ham, banned+infected and unclassified counts for an IP address,
  a percentage of unwanted (spam+banned+infected) messages out of the
  total count, and the associated score.

  Apart from starting a redis server on a loopback interface (except for
  changing its 'bind' setting in redis.conf, no other configuration changes
  are necessary, a database need not be initialized), here is an example
  configuration in amavisd.conf:

  @storage_redis_dsn = (
    { server => '[::1]:6379',     db_id => 1 },
    { server => '127.0.0.1:6379', db_id => 1 },
  );

  # list your MX and MSA mailer IP addresses or networks here:
  @ip_repu_ignore_networks = qw( 192.0.2.44 2001:db8::/64 );

  A redis server needs to support Lua scripting, which is available
  since version 2.6. Support for IPv6 is available since version 2.8.0
  of the redis server.


- Added support for decompressing LZ4 streams in mail attachments when
  an external utility lz4c is available and the 'file' utility recognizes
  such streams (probably since version file-5.17).  Default settings
  of @decoders and $map_full_type_to_short_type_re now recognize LZ4;
  if these settings are replaced by a configuration file, the config
  file needs to be updated to include the new entry.


- Added two minor content categories to the major ccat CC_UNCHECKED
  to allow distinguishing between reasons of decoders failure.
  * a minor ccat 1 now indicates that at least one mail part was
    encrypted or otherwise scrambled (e.g. password protected archive);
  * a minor ccat 2 now indicates that some of the limits for protection
    against mail bombs was exceeded (e.g. $MAXLEVELS, $MAXFILES,
    $MAX_EXPANSION_QUOTA, $MAX_EXPANSION_FACTOR).
  Based on a suggestion and a patch by Carsten Wolff.

  The additional information can be used in any of the *_maps_by_ccat
  settings, e.g.:
    $subject_tag_maps_by_ccat{CC_UNCHECKED.',1'} =
      [ '***UNCHECKED(Encrypted)*** ' ];
    $subject_tag_maps_by_ccat{CC_UNCHECKED.',2'} =
      [ '***UNCHECKED(OverLimit)*** ' ];
  or:
    $defang_by_ccat{CC_UNCHECKED.',2'} = 1;


- introduced a setting %final_destiny_maps_by_ccat, which makes it
  possible to specify by-recipient final destiny for each contents
  category, e.g. use D_REJECT on spam to some users, and D_BOUNCE or
  D_DISCARD or D_PASS for others. Introduced mostly for completeness.

  As a backward compatibility measure the existing %final_destiny_by_ccat
  is now an alias for the new %final_destiny_maps_by_ccat;


- added a setting $outbound_disclaimers_only. When set to true and
  disclaimers are enabled, it will only allow adding disclaimers
  to non-local recipients. For backward compatibility the default
  value is false (undef). Based on a patch by Quanah Gibson-Mount;


- the $recipient_delimiter setting can now hold a multi-character string,
  specifying all characters that can delimit an address extension from
  a base e-mail address. Previously this setting was restricted to a
  single character (typically a '+' or a '-').

  When parsing existing e-mail address any of the characters in
  $recipient_delimiter can delimit an address extension. When adding an
  address extension (through %addr_extension_maps_by_ccat), the first
  character in the $recipient_delimiter string is used as a delimiter.

  The change is now in line with a postfix 2.11 that added support
  for multi recipient-delimiters, and a similar feature in Dovecot.

  A patch contributed by Patrick Domack.


- added macros report_json and rot13 (to be used in a log template):

  * the macro 'report_json' expands to a JSON representation of a
    structured log event;

  * the macro 'rot13' replaces a string in its argument with an obfuscated
    string where letters are shifted by 13 positions of an English
    alphabet (a popular variant of a Caesar cipher to conceal spoilers);
    this may serve to (poorly) hide strings such as mail Subject or
    an e-mail address from casual browsing of a log;


OTHER

- dropped dependency on a CPAN module Redis, implementing our own
  client-side redis protocol implementation (Amavis::TinyRedis).
  It is faster and smaller, and supports opening sessions with a
  redis server over IPv6 (or over IPv4 or over a Unix socket).
  The redis server supports IPv6 starting with version 2.8.0.

  Currently supported options in @storage_redis_dsn are:
  server, db_id, password, and ttl.

  The 'server' specifies an INET or INET6 socket (a host IP address
  or name and a port number) or an absolute path to a Unix socket.
  An IPv6 address must be enclosed in square brackets. The default
  value is '127.0.0.1:6379'. Match this with your redis configuration.

  Option 'db_id' specifies a redis database index (given to a "SELECT"
  redis command). Its value is a (small) integer, defaults to 0.
  This allows for independent databases to co-exist on the same redis
  server, e.g. an amavis database and a SpamAssassin Bayes database.

  The 'ttl' option can override a global setting $storage_redis_ttl
  on a per-server basis. Its value is an integer, representing a number
  of seconds for expiration time of pen pals records. It defaults to
  $storage_redis_ttl, which in turn defaults to 16 days (in seconds).
  This setting does not affect IP reputation records, whose expiration
  time is computed dynamically.

  Example:
    $storage_redis_ttl = 22*24*3600;  # 22 days for pen pals records
    @storage_redis_dsn = (  # alternative servers, use the first which works
      { server => '[::1]:6379',      db_id => 1 },
      { server => '127.0.0.1:6379',  db_id => 1, password => 'abc...' },
      { server => '/tmp/redis.sock', db_id => 1, ttl => 8*24*3600 },
    );

  Btw, make sure to keep the setting $database_sessions_persistent
  at its default value (1, i.e. enabled), otherwise Redis performance
  will suffer somewhat.


- store only essential information for pen pals operation to a Redis
  storage back-end to save memory on a database server; information on
  inbound messages is no longer stored there, i.e. only information on
  originating messages is kept;

- more informative logging of pen pals query results when using a Redis
  storage back-end. The redis support code (Lua and protocol handling)
  was largely rewritten for efficiency since amavisd-new 2.8.1.

- added LDAP attribute amavisDisclaimerOptions 1.3.6.1.4.1.15312.2.2.1.47
  to LDAP.schema;  contributed by Quanah Gibson-Mount;

- reduced EDNS payload size from 1240 bytes to a conservative default
  of 1220 bytes when calling Mail::DKIM verifier;

- optimization: filter for public IP addresses from a Received trace
  only once;

- added one digit of precision in the TIMING log report to reported small
  elapsed times (below 5 ms);

- in a milter setup (AM.PDP) the log-id wasn't unique; adding a request
  sequence number to it; a patch by Andreas Schulze;

- avoid writing a notification to stdout about a warm reload for the benefit
  of a cron job; a patch by Andreas Schulze;

- reduced log level on some of the less useful log messages in a milter
  setup; a patch by Andreas Schulze;

- documentation README.sql-mysql: added "CREATE INDEX msgs_idx_mail_id..."
  with a note on an InnoDB requirement for a foreign key;  by Jernej Porenta;


WHY REDIS?

A redis database was chosen initially because SpamAssassin 3.4.0 supports
keeping its Bayes database in a redis server, which makes it very fast,
so this makes a redis database readily available to amavisd too.

Redis has some features that make it suitable for use as a pen pals
database, for Bayes storage, and now for IP reputation and structured
logging:

- automatic expiration of entries based on key's individual time-to-live
  setting makes explicit database maintenance unnecessary;

- accessible over INET (or Unix sockets) allows several amavisd hosts
  to use a common redis server, possibly running on a dedicated host;

- supports Lua scripting, which makes it possible to perform multiple
  basic operations in one go as a single application's functional
  operation. It reduces multiple network round-trip times to a single
  network transaction, reducing network packet rate and latency;

- compared to SQL storage for pen pals (and for Bayes database),
  the redis read speed is somewhat faster, and the write speed is
  MUCH faster;

- as an in-memory database with optional periodic disk persistence
  it makes it suitable for use as a pen pals, as IP reputation and
  as Bayes storage: it is fast, and a potential redis server restart
  reloads data from the last snapshot, thus only losing the last
  minute or two of updates when trouble strikes, which is acceptable
  for these three databases.

- makes it possible to eliminate SQL r/w storage if its only purpose
  was to provide pen pals functionality (and SpamAssassin's Bayes);

Caveat:

Redis server does not offer access controls or strong authentication
mechanisms. For running a server on the same host as amavisd is running
the solution is straightforward: just bind the redis server to a
loopback interface or use a Unix socket. If a network access is desired,
consider protecting the redis server by a firewall (host-local, or
on a dedicated subnet).


---------------------------------------------------------------------------
                                                              June 28, 2013
amavisd-new-2.8.1 release notes

COMPATIBILITY

- when 0MQ (a.k.a. ZeroMQ) is used between Amavis components as an
  internal messaging protocol, make sure to replace all 0MQ-enabled
  Amavis components on upgrading amavisd, as the internal protocol
  has changed slightly, taking advantage of 0MQ multi-part messages
  for better performance. Affected programs are: amavis-services,
  amavisd-status, amavisd-snmp-subagent-zmq, and amavisd.

  NOTE: The Crossroads I/O project (libxs) ceased development on
    July 2012, to be replaced by nanomsg eventually by the same author.

    The 0MQ library (libzmq) is currently (2013) the best choice,
    the preferred library version is 3.2.2 or later along with
    the ZMQ::LibZMQ3 Perl interface module and ZMQ::Constants.
    The older version 2 of the library, along with an older perl
    module ZeroMQ, should be fine too, but lacks support for IPv6.

- amavisd is compatible with perl 5.18.0 and with SpamAssassin 3.4.0


BUG FIXES

- fixed a bug in the SMTP client code, where the final SMTP status did
  not reflect a failure status of a DATA command from a back-end MTA.
  This caused a reception of a mail message to be confirmed but a message
  was then lost, as it could not be passed to a back-end MTA. The bug
  went unnoticed for years, as the commonly used MTAs normally reject
  either at the MAIL FROM, at RCPT TO, or at the data-dot stage, but not
  at the DATA command. Reported by Deniska-rediska;

- fixed calling an external spam scanner DSPAM or Bogofilter, which
  failed with a message:
    auto-learning with spam scanner ... failed: error running program
  Reported by Tonio;

- if a configuration file path as given through a command line option -c
  or as an argument to include_config_files() was not an absolute path,
  and that file contained an error, the do() would search the @INC list
  for alternative files of the same name, and reported an unrelated error
  (typically: No such file or directory) instead of reporting the true
  reason for a failure;

- fixed a regular expression in amavisd.conf for an 'Avast!' AV entry
  to properly extract a virus name; a patch by Ralf Hildebrandt;

- added LDAP errors LOCAL_ERROR and OPERATIONS_ERROR to the set of
  expected error conditions which lets amavisd retry the failed
  operation; a patch by Quanah Gibson-Mount;


NEW FEATURES SUMMARY

- new Redis storage for the "pen pals" feature;

- improved IPv6 support;

- support for p0f v3;

- new macros ip_trace_all and ip_trace_public;

- amavisd-status now shows a bar graph display
  of the number of active processes;

- the timing report log entry can show CPU usage
  at log level 2 if a module Unix::Getrusage is available;


NEW FEATURES

- new Redis storage for the "pen pals" feature: instead of (or in addition
  to) the existing SQL storage for keeping data on past mail messages
  and contributing negative spam score to recent/ongoing correspondence,
  this data can now be kept on a Redis server. Unlike the SQL backend,
  to minimize memory usage the Redis backend keeps only data which are
  required for pen pals operation.

  Redis storage for pen pals can offer a small speedup compared to a
  well-tuned SQL server, offers automatic expiration of data based on a
  configured time-to-live setting, and a simpler setup (no need to manually
  set up an SQL schema). A drawback is that a Redis server keeps all data
  in memory (with optional periodic persistence on disk), which might be
  of concern for busy sites with a long time-to-live setting. Potential
  drawbacks of a Redis server are also its lack of sophisticated access
  controls.

  A redis database may be shared between hosts running amavisd. It can
  be accessed either locally over a Unix socket, or using an INET socket
  (IPv4) over a loopback interface (better security) or over a local
  network. Version 2.6.14 of a Redis server does not offer access over
  IPv6, but version 2.8.0 and later does.

  Required dependencies when Redis support is enabled are a perl module
  "Redis" ( http://search.cpan.org/dist/Redis/ ) version 1.954 (or 1.956)
  or later and a redis server ( http://redis.io/ ) with support for Lua
  scripting (i.e. version 2.6 or later). Most pen pals application-level
  details on queries and storage management is delegated to Lua scripts
  running on a Redis server. Redis module currently requires a patch to
  support communication with a redis server over IPv6.

  Expiration time of items stored in a redis database is controlled by
  a setting $storage_redis_ttl, which is a time-to-live time in seconds
  and defaults to 16 days:
    $storage_redis_ttl = 16*24*60*60;

  Redis support in amavisd is enabled by setting a list @storage_redis_dsn
  to a nonempty value (similar to @storage_sql_dsn for an SQL support).
  If @storage_redis_dsn is empty, the redis support code is not loaded
  and does not occupy any storage.

  The configuration setting @storage_redis_dsn is a list of hashrefs
  (a hashref is a { ... } in perl syntax), each of which specifies
  one Redis server that can be used: if there is more than one entry
  in the list, a connection to each server is attempted until one is
  found where connection succeeds. Each entry is an associative array
  of key/value options which are passed on to a new() method of a perl
  Redis module unmodified and unverified. Usual options are: 'server',
  'sock', 'reconnect' - see documentation of a Redis module for details.
  All Redis module options have their default value, so it is alright
  to specify an empty hash, which means to connect to a default server.

  Apart from options which are passed to a Redis module, two additional
  options are interpreted by amavisd itself and are not passed on to a
  Redis perl module. The 'db_id' options is an optional database index,
  used in a SELECT redis command to choose a (sub)database to use.
  By default a database index is 0. The 'ttl' option overrides a global
  time-to-live setting as specified in $storage_redis_ttl, allowing to
  chose different expiration times of stored items for each server.

  Examples:

  # disables Redis (is a default)
  @storage_redis_dsn = ();

  # enables Redis, use a single default local redis server, all
  # defaults are supplied by a Redis perl module, database index 0
  @storage_redis_dsn = ( {} );

  # access a local redis server over a loopback interface on TCP port
  # 6379, select database index 1, try reconnecting for 20 seconds
  # before giving up when a redis server is down (or restarting)
  @storage_redis_dsn =
    ( { server => 'localhost:6379', reconnect => 20, db_id => 1 } );

  $storage_redis_ttl = 16*24*60*60;  # expiration time for data 16 days
  @storage_redis_dsn = (
    { sock => '/tmp/redis.sock',  reconnect => 20, db_id => 1 },
    { server => 'localhost:6379', reconnect => 20, db_id => 1 },
    { server => 'backup.example.com:6379', db_id => 1, ttl => 5*24*60*60 },
  );

  Some existing settings also affect Redis pen pals operation:
    $database_sessions_persistent, $penpals_bonus_score,
    $penpals_halflife, $penpals_threshold_low, $penpals_threshold_high.

  Starting with version 3.4.0 the module SpamAssassin can also use Redis
  storage for its global Bayes database. Amavisd and SpamAssassin can use
  the same Redis server for their databases, although it is sensible that
  they use separate (sub)databases by choosing a different database index
  (redis SELECT command) through a 'db_id' configuration option, which
  defaults to 0.

  NOTE: As more experience with Redis is gained, it is possible that
  a redis storage schema may change in future versions, possibly in an
  incompatible way. As its purpose is short-term storage, this should
  not be of great concern.


- improved IPv6 support: p0f-analyzer.pl can now communicate with amavisd
  processes over an INET6 socket (or over an INET or UNIX socket as before).
  Extended the protocol between amavisd and p0f-analyzer.pl to allow
  queries on IPv6 addresses;

- rewritten p0f-analyzer.pl to support a newer p0f v3 output format,
  while still recognizing an older p0f v2 output format;
  suggested by Jernej Porenta;

  NOTE: the p0f v3 does not provide a compact output on stdout like p0f v2
  could by using an option -l, so leave out the option -l with p0f v3;

- improved IPv6 support: program amavisd-snmp-subagent-zmq can now
  attach as an AgentX to a Net-SNMP daemon snmpd over an INET6 socket;
  the AgentX socket is specified by $agentx_sock_specs near the beginning
  of a file amavisd-snmp-subagent-zmq, e.g.:
    $agentx_sock_specs = 'tcp6:localhost:705';  # talk to snmpd over IPv6
    $agentx_sock_specs = 'tcp:localhost:705';   # talk to snmpd over IPv4
    $agentx_sock_specs = '/var/agentx/master';  # talk over a UNIX socket

- improved IPv6 support: program amavisd-submit can now submit a mail
  message to amavisd over an INET6 socket;

- a macro W can now produce a list of all virus scanners invoked,
  along with a list of virus names each scanner detected;
  suggested by Patrick Ben Koetter;

- new macros ip_trace_all and ip_trace_public:

  ip_trace_all  provides a list of IP addresses found in the 'Received from'
     trace of a mail header, one entry for each Received header field,
     including possibly invalid IP addresses and private IP addresses;
     Missing addresses are substituted by with a '?' (e.g. in Received
     header fields for local or other non-IP mail submissions).
     The list order corresponds to the order of 'Received' header fields
     as found in a mail header, top-down, i.e. first entry of the list
     is the topmost (the most recent) 'Received' header field, so
     chronologically in reverse;

  ip_trace_public  provides a list of valid public IP addresses found in the
     'Received from' trace of a mail header.  Missing, invalid or private
     IP addresses are not included in this list, so there may be more
     'Received' header fields in a mail header then entries in this list.
     The list order corresponds to the order of 'Received' header fields
     as found in a mail header, top-down, i.e. first entry of the list
     is the topmost (the most recent) 'Received' header field with a valid
     public IP address, so chronologically in reverse;

  suggested by Tomislav Mihaliček;

- templates for administrator notifications, recipient notifications,
  and sender notifications now use macro 'ip_trace_all' instead of macros
  'e' and 't' in order to report the full 'received' trace, not just the
  first hop;

- macro supplementary_info recognizes new arguments: VERSION, SUBVERSION,
  and RULESVERSION, providing additional information from SpamAssassin
  correspond to equivalent SpamAssassin tags;

- a new command line option -X allows controlling some exotic features,
  useful for example in debugging or automatic testing. The option takes
  one argument which is a comma-separated list of keywords. Currently
  the only recognized option is '-X no_conf_file_writable_check',
  which disables security checks on configuration files, which can be
  useful in automatic testing, but is dangerous to use in production.
  Suggested by Alexander Wirt;

- a configuration setting $sa_debug may now specify a comma-separated
  list of SpamAssassin debug facilities, complementing a similar method
  of specifying these facilities through a command line option -d.
  If $sa_debug looks like a simple boolean (or is undefined), the
  traditional semantics still applies: a false prepends an 'info'
  to the list, while a true prepends 'info' and 'all' to the list
  of SpamAssassin debug facilities.

  Examples:
   $sa_debug = 0;  # same as:  $sa_debug = 'info';
   $sa_debug = 1;  # same as:  $sa_debug = 'info,all';
   $sa_debug = 'info,dns,async,bayes';

- pass the size of an original mail body as a 'supplementary attribute'
  to SpamAssassin for the benefit of a 'check_body_length' eval rule
  (new with SpamAssassin 3.4.0). The original mail body size may
  differ from the message as seen by SpamAssassin in case of truncation
  of large messages to mail_body_size_limit.

- to the output of amavisd-status add a simple bar graph display (with
  an exponential-decay peak indicator) of the number of active processes;

- if a module Unix::Getrusage is available, the timing report log entry
  (at log level 2) is enhanced: in addition to total elapsed time
  (wall clock) spent in processing a message, it also shows a sum of
  CPU user and system times spent by amavisd process and its spawned
  processes:

  old format example:
    size: 3815, TIMING [total 1901 ms] - ...

  new format example:
    size: 3815, TIMING [total 1901 ms, cpu 657 ms] - ...

  Additionally, a separate RUSAGE log entry is produced at log level 2,
  indicating resource usage spent by the last task. A field maxrss is
  a gauge (an absolute current value), all other fields are counters,
  so a difference between a previous and a current value is shown in
  the log. Each field value is a pair of numbers delimited by a plus:
  the first value corresponds to resource usage by the reporting amavisd
  child process, the second value corresponds to its spawned processes
  (e.g. file(1), gzip(1), etc.).

  Example (wrapped for clarity):

    size: 3815, RUSAGE minflt=10114+5223, majflt=0+0,
      nswap=0+0, inblock=0+0, oublock=9+0,
      msgsnd=819+9, msgrcv=211+3, nsignals=0+0,
      nvcsw=128+19, nivcsw=32+41, maxrss=164304+194012,
      ixrss=520+14016, idrss=66300+128392, isrss=24960+7680,
      utime=0.390+0.079, stime=0.079+0.108

  See getrusage(2) Unix man page for details.


OTHER

- the 'amavisd genrsa' command will now warn if the requested DKIM
  signing key size is below 1024 bits, as required by RFC 6376;

- on amavisd startup a check on available private DKIM signing keys
  (as declared by dkim_key) will now warn if a key size is below
  1024 bits as required by RFC 6376, and log an information message
  if a key size is below a configured $dkim_minimum_key_bits size
  (defaults to 1024, currently 768 would still be a sensible value);

- for purposes of DKIM-based whitelisting (@author_to_policy_bank_maps)
  and @signer_reputation_maps spam scores, valid signatures with
  public keys shorter than $dkim_minimum_key_bits bits (default 1024,
  equivalent to a lower limit as presently used by Google) are now
  ignored, with an informational message logged at level 1.
  To disable this check, set $dkim_minimum_key_bits to undef or to 0.

- consider Unique local addresses (ULA) fc00::/7 non-public (RFC 4193),
  dropped site-local addresses fec0::/10 (deprecated by RFC 3879),
  adjusting the default setting of @mynetworks accordingly;

- consider the "Shared Address Space" 100.64.0.0/10 non-public (RFC 6598);

- adjust parsing the <zone_id> syntax of a scoped IPv6 address
  as per RFC 6874;

- updated an AV entry for a Sophos Anti Virus: the scanning program
  used to be named 'sweep', now it is 'savscan'; thanks to mefiX;

- updated a default value of @virus_name_to_spam_score_maps: updated
  entry for Doppelstern and added entries for Bofhland and PORCUPINE;

- increase an arbitrary sanity limit on %smtp_reason_by_ccat strings
  from 100 to 450 characters (RFC 5321 allows 512 character reply lines);

- relax testing file type of a configuration file, now a configuration
  may also be passed to amavisd through a named pipe (fifo), possibly
  facilitating testing or unusual deployments;

- relax a requirement that a $QUARANTINEDIR directory needs to be
  writable: if $*_quarantine_method template settings include a
  subdirectory (e.g.: $spam_quarantine_method='local:W%P/spam/%m.gz'),
  such subdirectories must already exist and should be writable,
  but the top-level $QUARANTINEDIR directory need not be writable;

- convert an IPv4-mapped IPv6 address into a plain IPv4 dot-quad form
  when found in Received header fields, in socket local or peer address,
  in ADDR field of an XFORWARD smtp extension command, or in an AM.PDP
  attribute client_address. See draft-cmetz-v6ops-v4mapped-api-harmful
  and draft-itojun-v6ops-v4mapped-harmful for potential caveats;

- drop a support for direct queries to p0f v2, as it never worked well
  due to bugs in p0f v2. The p0f v3 changed the query protocol, but
  a query does not include port numbers (see RFC 6302), so using the
  p0f-analyzer.pl interface is still the only reliable approach;

- use sysread() instead of read() when reading from /dev/urandom
  to avoid leaving entropy data in I/O buffers; also changed interface
  name to sub read_random_bytes(), which now reads directly into a
  scalar buffer, provided by an argument;

- fix uniform random distribution when generating a random PIN for an
  attachment password (when releasing and $release_format is 'attach')
  (not a security issue);

- added keepalive options to a call to Net::LDAP->new, recognized since
  Net::LDAP 0.53; a patch by Quanah Gibson-Mount;

- removed option inet6 from a default LDAP setup ( $ldap_sys_default ),
  as Net::LDAP changed semantics in an incompatible way;
  presumably the Net::LDAP now does the right thing by default;
  suggested by Quanah Gibson-Mount;

- use a low-level 0MQ interface instead of ZeroMQ / ZMQ abstractions;
  (i.e. ZeroMQ raw interface or ZMQ::LibZMQ3 or ZMQ::LibZMQ2);

- taking advantage of 0MQ multi-part messages the number of IP packets
  transmitted is now radically decreased in favour of sending larger
  but fewer packets;

- when generating 'Abuse Reporting Format (ARF) Reports' add a field
  Source-IP and use UTC timestamps in the Arrival-Date field, in accordance
  with RFC 6692;

- drop (opportunistic) loading of a module Devel::SawAmpersand and testing
  the Devel::SawAmpersand::sawampersand(), variables $&, $` and $' are
  no longer slow since Perl 5.17.7, the PL_sawampersand became a constant,
  there is no longer any need of report it;

- documentation update: remove vestiges of a field 'spam_modifies_subj'
  in README.sql, README.sql-mysql, this field was obsoleted in 2.7.0;
  thanks to Patrick Ben Koetter;


---------------------------------------------------------------------------
                                                              June 30, 2012
amavisd-new-2.8.0 release notes

Contents:
  COMPATIBILITY
  BUG FIXES
  NEW FEATURES SUMMARY
  NEW FEATURES - 0MQ
  NEW FEATURES - OTHER
  OTHER


COMPATIBILITY

- removed an old compatibility measure: default value of @banned_admin_maps
  was changed from:
    @banned_admin_maps = (\$banned_admin, \%virus_admin, \$virus_admin);
  to a more consistent:
    @banned_admin_maps = (\$banned_admin);
  The previous default value of @banned_admin_maps tried to maintain
  compatibility with versions before the setting was separated from
  its companion @virus_admin_maps. Now this compatibility is no longer
  considered necessary and contributes to some confusion, so it was dropped.
  See 2.4.0 and 2.2.1 release notes for previous changes to this setting.

- quarantining to an mbox format file used to include a local time in an
  mbox separator line, which differs from RFC 4155 and common practices
  of using an UTC timestamp; a time zone of a timestamp in separator lines
  is now changed to UTC;


BUG FIXES

- fixed initial evaluation of dynamic (i.e. per policy bank) values of
  $enable_dkim_verification, $enable_dkim_signing and $bypass_decode_parts
  across all declared policy banks; these policy bank entries may be scalars
  of references to such;

- finely adjust a message size for de-stuffed dots according to a size
  definition in RFC 1870; avoids occasional message size mismatch when
  using an antispam interface module SpamdClient (implementing client-side
  of a spamc/spamd protocol);

- updated LDAP.ldif to match LDAP.schema; provided by Quanah Gibson-Mount;

- updated AMAVIS-MIB.txt and amavisd-snmp-subagent: changed type of
  SNMP variables *MsgsSize* in the group amavisStats 7 from Counter32
  to Counter64 for consistency with other *MsgsSize* variables in groups
  amavisStats 3 and amavisStats 9;

See also the bug fixes section of 2.7.1 and 2.7.2 release notes.
All fixes applied to 2.7.1 and 2.7.2 are incorporated in the 2.8.0 code.


NEW FEATURES SUMMARY

- For monitoring and statistics gathering purposes a new set of utilities
  and service processes is available based on a message passing paradigm,
  using a 0MQ (a.k.a. ZMQ, ZeroMQ, or Crossroads I/O) library. This
  replaces a functionally similar set of utilities based on a shared
  BerkeleyDB database, with a benefit of avoiding lock contention
  altogether. This can bring sigificant speedups, most pronounced on
  a host with many busy amavisd child processes.

- Applied numerous fine-grained optimizations based on a NYTProf profiler
  results. Optimizations include a reduction in a number of generated
  Perl opcodes and similar micro-optimizations. This accounts for a large
  amount of small changes in the code.

- Our current statistics (Q4 2011) shows that 80 % of messages are below
  30.000 bytes, and 90 % of mail messages are below 100.000 bytes in
  size. As an optimization, messages below 100 KiB in size are now kept
  and processed in memory, including passing them more optimally to
  SpamAssassin 3.4.0. Some file activity is still there, but is much
  reduced. If $TEMPBASE also resides on an SSD disk (or a RAM disk),
  observed speedup between 2.7.2 and 2.8.0 was 3 to 8 percent on a
  busy host (with monitoring disabled, so as not to skew a measurement).

- Use a module IO::Socket::IP if available, instead of dealing directly
  with low-level modules IO::Socket::INET and IO::Socket::INET6.
  The IO::Socket::IP is a Perl core module since Perl version 5.19.8;

- choose more appropriate defaults if running on an IPv6-only host
  (like connecting to ::1 instead of 127.0.0.1 which may not exist);

- amavisd-release now also supports connecting to amavisd over IPv6;

- as a debugging aid it is now possible that a late event triggers full
  logging of earlier events that occurred during processing of a current
  mail message;

- $enable_ldap setting is now dynamic, i.e. can be changed by a policy
  bank, which makes it possible to selectively disable LDAP lookups
  per policy bank;

- optionally avoid persistent connections to SQL and LDAP servers;

- it is now possible to disable calling an external file(1) utility
  but still have MIME parts decoding enabled;

- added support in Amavis::SpamControl::ExtProg for an external spam scanner
  Bogofilter;

- added locking options to @spam_scanners entries, to be used with external
  scanners which need but do not implement locking of their resources
  by themselves;

- added a global configuration setting $sa_userprefs_file, which is passed
  on to SpamAssassin as a 'userprefs_filename' parameter at initialization;

- added a subroutine iso8601_weekday(), potentially useful with partitioning;

- added several new macros available to logging and notification templates;


NEW FEATURES - 0MQ

- added support for monitoring and auxilliary services, communicating
  with amavisd and among themselves through 0MQ sockets (also called ZMQ
  or ZeroMQ, or Crossroads I/O or XS). This method offers similar features
  as current services amavisd-nanny, amavisd-agent and amavisd-snmp-subagent,
  but use message passing paradigm instead of communicating through a shared
  Berkeley database. This avoids locking contention, so the gain can be
  significant for a busy amavisd setup with lots of child processes.

  New files in the package are:

  - amavis-mc  is a master supervisor process ( master of ceremonies :),
      to be started at boot time as root, or as a user vscan/amavis.
      Currently its only function is to spawn three instances of
      amavis-services processes with dropped privileges, to monitor
      and restart them in case they fail, and to terminate them when
      itself if being terminated. Preferably this process should be
      started before amavisd and before amavisd-snmp-subagent-zmq,
      although things would eventually catch up even if this is not
      the case. This process must run on the same host as amavis-service
      processes.

  - amavis-mc_init.sh  is an example FreeBSD-style startup/shutdown shell
      script for starting/stopping the amavis-mc process;

  - amavis-service  implements three services, chosen by a command line
      argument. It should be running as user vscan/amavis (not as root!).
      All its instances are typically started/stopped automatically by
      the amavis-mc process with dropped privileges. A note for manual
      testing (started from a command line, not by an amavis-mc process):
      make sure to run amavis-service under the same UID as the amavisd is
      running. If 0MQ cannot write to a socket due to privilege violation,
      messages are silently dropped. Service processes as implemented
      by amavis-service must run on the same host as amavisd for two
      reasons: they communicate with amavisd child processes through a
      Unix socket, and at least some of these services need visibility
      of amavisd processes through signals (kill). At least the forwarding
      service must be running when amavisd is operational with $enable_zmq
      at true, otherwise amavisd child processes might eventually stall when
      their message queue fills up. Preferably amavis-service processes
      should be started before amavisd is started, although things would
      eventually catch up even if started late or restarted during operation.

  - amavisd-status  is a user utility program, similar to amavisd-nanny,
      which connects to amavis-service 0MQ socket and displays a status
      of running amavisd child processes. This program communicates with
      amavis-service processes through an inet socket and can in principle
      run on a different host (in which case sockets must be bound to a
      publicly reachable interface, not loopback). The program can be
      started and stopped at any time, can run under any UID as long as
      it has access to a 0MQ socket $outer_sock_specs, and may run in
      multiple instances if necessary.

  - amavisd-snmp-subagent-zmq  is a SNMP AgentX program, functionally
      equivalent to amavisd-snmp-subagent. It collects information from
      amavis-service processes and passes it as a MIB to an SNMP daemon.
      This process communicates with amavis-service processes through an
      inet socket and can in principle run on a different host (in which
      case sockets must be bound to a publicly reachable interface, not
      loopback). If access to the amavisMta MIB (1.3.6.1.4.1.15312.2.1.3)
      subtree is desired, the amavisd-snmp-subagent-zmq must run on
      the same host as Postfix in order to have access to its queue
      directories. In principle there could be more than one instance of
      the amavisd-snmp-subagent-zmq running at the same time, although
      this hardly serves any practical purpose.

  The old amavisd-agent utility does not currently have a 0MQ equivalent;
  use snmpbulkwalk with net-snmp and amavisd-snmp-subagent-zmq for similar
  functionality.

  Please see comments in amavis-service for details and configuration
  of sockets.

  To enable amavisd child processes to start sending their status and
  statistics information to amavis-service services, please set a
  configuration variable $enable_zmq to true in amavisd.conf:
    $enable_zmq = 1;

  Optionally a 0MQ socket can be changed, it defaults to:
    @zmq_sockets = ( "ipc://$MYHOME/amavisd-zmq.sock" );
  The @zmq_sockets is a list of 0MQ sockets, so in principle amavisd
  processes can report their state to multiple instances of amavis-service.

  Both the 0MQ-based ($enable_zmq=1) and the BerkeleyDB-based ($enable_db=1)
  monitoring implementations can coexist: use one or the other, or both
  at the same time, or turn off both if monitoring is not needed.

  Required Perl modules are either:
    ZeroMQ, which interfaces with a version 2 of a libzmq library
      (in case of FreeBSD that would be ports net/p5-ZeroMQ and devel/zmq),
      or with a Crossroads I/O library libxs (now defunct);
  or
    ZMQ::LibZMQ2 and ZMQ::Constants modules
      with a version 2 of a libzmq library (or with a Crossroads I/O library);
  or
    ZMQ::LibZMQ3 and ZMQ::Constants
       with a version 3 of a libzmq library (FreeBSD ports: devel/zmq-devel).
       Although Crossroads I/O library is natively equivalent to a libzmq
       version 3 library, the ZMQ::LibZMQ3 perl module does not currently
       support interfacing with Crossroads I/O (libxs).

  NOTE: The Crossroads I/O project ceased developmenet in July 2012,
    to be replaced by nanomsg eventually (by the same author).
    The 0MQ is currenty (2012/2013) the best choice.

  Tested combinations of a Perl interface module with a message passing
  library:

  * with 0MQ ( http://www.zeromq.org/ ):
    ZeroMQ 0.21       + zeromq 2.2.0
    ZMQ::LibZMQ2 1.01 + zeromq 2.2.0
    ZMQ::LibZMQ3 1.00 + zeromq 3.1.0

  * with Crossroads I/O ( http://www.crossroads.io/ ):
    ZeroMQ 0.21       + libxs 1.2.0 (zmq v2.1 compatible)
    ZMQ::LibZMQ2 1.01 + libxs 1.2.0 (zmq v2.1 compatible)
    ZMQ::LibZMQ3 1.00 + libxs 1.2.0 (native) (no, XS not supported by LibZMQ3)


  PERFORMANCE with 0MQ

  When scanning messages for spam (using SpamAssassin), a spam scan
  takes most of the processing time and resources, so replacing a
  BerkeleyDB-based monitoring with a 0MQ-based monitoring brings some
  speedup on a busy server, but the change is not dramatic.

  But as an extreme counter-example: when DKIM signing passed messages,
  with most other checks disabled, a speedup can be by a factor of 10.
  Synthetic benchmark: 7 KiB messages, 8 child processes, log level 2,
  CPU Intel Core i7-960 (4 cores, 8 threads), $TEMPBASE on an SSD disk,
  result: 19 mail messages per second with BerkeleyDB, over 200 mail
  messages per second with 0MQ, and still 130 msg/s with all checks
  (*except* spam scanning) enabled.


  SECURITY CONSIDERATIONS with 0MQ

  0MQ libraries (zeromq or libxs) do not provide any application-level
  security beyond what is available with standard Unix or INET or INET6
  sockets. This means that Unix-style inter-process sockets are protected
  by the usual file system's ownership and protection bits, and access
  to INET/INET6 sockets is only protected by interface binding and system
  firewall mechanisms.

  Communication between amavisd child processes and the forwarding service
  (amavis-services msg-forwarder) goes by default over a Unix-style socket,
  owned by UID vscan/amavis. Communication between utilities and service
  processes goes by default over an INET socket bound to a loopback
  interface, and as such is accessible to any process running on the
  same host, but is not accessible from other hosts. If access to these
  sockets from other hosts is desired, their binding should be changed
  to all or to ethernet interfaces, making them accessible to any host
  in the network, so host-firewall rules should be implemented if access
  needs to be restricted.

  Having said that, currently information passing through 0MQ sockets
  is limited to statistics and health status only, and does not affect
  operation of amavisd child processes, nor is any sensitive information
  passed around, so access to these sockets from unauthorized sources
  is not expected to pose a high security risk.


  0MQ and IPv6

  IPv6 is supported by zeromq library starting with version 3, and by
  libxs (any version). Because the application needs to pass information
  to a library about a type of sockets needed and there is no universal
  and backward compatible (with v2) way to do so, currently amavisd does
  not offer any configuration option to choose INET6 over INET on 0MQ
  sockets. This restriction is expected to be lifted in the next version.
  Currently on an IPv6-only host one can choose to use Unix-style sockets,
  or patch amavis programs to turn off a ZMQ_IPV4ONLY socket option
  (these are commented-out in present code).


NEW FEATURES - OTHER

- if a module IO::Socket::IP is available, amavisd will use this module
  to create its client-side inet or inet6 sockets, instead of using the
  low-level modules IO::Socket::INET and IO::Socket::INET6. This delegates
  some of the dirty details handling to IO::Socket::IP, such as using the
  getaddrinfo(3) system service to resolve host names, and dealing with
  dual-stack multihomed host names. If IO::Socket::IP is not available,
  the IO::Socket::INET or IO::Socket::INET6 are used directly instead,
  to preserve compatibility. Please use a fairly recent version of
  IO::Socket::IP, testing was done with versions 0.08 and 0.16.

- added a subroutine read_cidr() which can read a Postfix style CIDR file,
  with a syntax interpreted according a Postfix cidr_table(5) man page.
  The subroutine returns a ref to an array by default (but can also
  produce a hash, and is able to add data to an existing array or hash).

  Typical use:
    @mynetworks_maps = ( read_cidr('/etc/postfix/mynetworks.cidr') );
    @client_ipaddr_policy = map(($_,'MYNETS'), @mynetworks_maps);

  or:
    @mynetworks = @{ read_cidr('/etc/postfix/mynetworks.cidr') };

  For details and more complex usage see leading comments in the read_cidr
  subroutine;

- as a debugging aid it is now possible that a late event triggers full
  logging of earlier events that occurred during processing of a current
  mail message. This is implemented by writing all log events to a temporary
  file regardless of their log level and of the current $log_level setting.
  A later event can cause the captured temporary log to be copied to a
  regular log. Each child process keeps its own temporary log file open
  all the time, the file is rewound and truncated after each mail message
  processing and reused for the next capture, so its size rarely exceeds
  about 50 kB.

  Maintaining a temporary capture log is enabled by setting a configuration
  variable $enable_log_capture to true:
    $enable_log_capture = 1;

  Enabling a log capture costs a little bit of resources as amavisd needs
  to assemble and format all log messages regardless of their log level, not
  benefiting from early pruning of log entries not reaching the $log_level.
  Nevertheless the small overhead is quite acceptable when troubleshooting
  some rarely occurring problem and keeping $log_level permanently at the
  max is not acceptable due to sheer volume of debug logging.

  The captured log is read from a temporary file and copied to a regular
  log as log level 1 entries (i.e. at LOG_INFO syslog priority) if a
  dynamic variable $enable_log_capture_dump is true by the end of mail
  message processing. A chunk of captured log entries is preceded/ended
  by a log line:
    CAPTURED DEBUG LOG DUMP BEGINS
    CAPTURED DEBUG LOG DUMP ENDS
  and each such log entry has a prepended timestamp (hours, minutes,
  seconds with milliseconds) of a capture time.

  The $enable_log_capture_dump variable can be turned on directly
  by some debugging patch code, but is more conveniently loaded by
  activating a policy bank, e.g.:

  $policy_bank{'SLOW'} = {
    enable_log_capture_dump => 1,
  };

  $policy_bank{'GOTCHA'} = {
    enable_log_capture_dump => 1,
  };

  which can be loaded for example by a custom hook, e.g.:

  sub after_send {
    my($self,$conn,$msginfo) = @_;
    if (Time::HiRes::time - $msginfo->rx_time > 5.5) {
      Amavis::load_policy_bank('SLOW', $msginfo);
    }
    # or perhaps:
    if ($msginfo->sender =~ /some-regexp/) {
      Amavis::load_policy_bank('GOTCHA', $msginfo);
    }
  }

  Btw, the only purpose of having two different policy banks in the example
  is to be able to see at a glance in the log which one was activated.

- the @decoders list is made a bit more flexible: the first entry in
  each tuple (a short type name) may be a scalar string as before,
  or may be a reference to a list of such names, in which case the
  tuple applies to all listed short types.

  Example:
    [['zip','kmz'], \&Amavis::Unpackers::do_unzip],

  which previously needed two entries:
    ['zip', \&Amavis::Unpackers::do_unzip],
    ['kmz', \&Amavis::Unpackers::do_unzip],

- support an external decompressor lrzip for a .lrz format.
  Thanks to Jernej Porenta for a suggestion;

- $enable_ldap setting is now dynamic, i.e. can be changed by a policy
  bank, which makes it possible to selectively disable LDAP lookups
  per policy bank. The LDAP code is loaded and a connection to an LDAP
  server is established if at least one policy bank has enable_ldap set
  to true (e.g. enable_ldap => 1 ) or a global $enable_ldap is true,
  but queries are disabled if currently active enable_ldap is false.
  Suggested by Tomislav Mihaliček;

  Example:

    $enable_ldap = 1;
    $policy_bank{'GUESTS'} = {
      enable_ldap => 0,
    };

  or the other way around:

    $enable_ldap = 0;
    $policy_bank{'INBOUND'} = {
      enable_ldap => 1,
    };

- optionally avoid persistent connections to SQL and LDAP servers - at
  the expense of about 3 to 7 ms elapsed time for a reconnect. Persistent
  connections from mostly idling child processes consume database server
  resources (e.g. a TCP socket), and may become stuck when some intermediate
  stateful device like a firewall or a NAT decides to drop stale sessions.

  The behaviour is controlled by a setting $database_sessions_persistent:
  when true sessions remain open even after a SMTP session (from an MTA) has
  closed; when false sessions are closed after each SMTP session closedown.
  The default value is true for compatibility with earlier versions.
  Problem reported by Jernej Porenta;

- it is now possible to disable calling an external file(1) utility
  but still have MIME parts decoding enabled:  $file = undef;
  This may save some contents classification time, at the expense of
  losing results of a file(1) utility (i.e. short file type information)
  for banning checks. Disabling file(1) checks can be useful when most
  other checks are disabled too, e.g. in an amavisd instance whose only
  task is DKIM-signing, like after a mailing list manager fanout;

- added Amavis::SpamControl::ExtProg support for an external spam scanner
  Bogofilter. An entry in @spam_scanners list for invoking the bogofilter
  program can be something like:

  @spam_scanners = (
    ['Bogofilter', 'Amavis::SpamControl::ExtProg', 'bogofilter',
      [ qw(-e -v)],  # -u
      mail_body_size_limit => 65000, score_factor => 1.0,
    ],
  # ['SpamAssassin', 'Amavis::SpamControl::SpamAssassin' ],
  );

  The bogofilter interface code assigns a hard-coded score +5 to
  bogofilter's result status 'Spam', -5 to 'Ham' and 0 to 'Unsure'.
  This score is multiplied by score_factor (default 1 if not given)
  to produce the final spam score which is summed up with scores
  as contributed by other spam scanners in the @spam_scanners list.
  The 'X-Bogosity' header field will be inserted into forwarded message,
  unless prevented by a corresponding %allowed_added_header_fields entry.

  Based on a patch contributed by Stephen Davies.

- added Amavis::SpamControl::ExtProg support for auto-learning on external
  spam scanners; experimental: works, but may change in future versions;
  *** to be documented ***; Suggested by Jernej Porenta;

- added locking options to @spam_scanners entries, to be used with
  external scanners which do not implement database locking by themselves.
  Options are: 'lock_file', 'lock_type', 'classifier_lock_type' and
  'learner_lock_type'. The 'lock_file' specifies a file name on which
  a flock(2) is acquired. A lock type can be 'shared', 'exclusive',
  or 'none'. The 'shared' acquires a LOCK_SH (shared read) lock,
  the 'exclusive' acquires a LOCK_EX (exclusive write) lock on a given
  file. A default lock type is 'exclusive' if the lock_type option is
  missing. If either a lock_file is absent or empty, or a lock type is
  'none', then no locking is performed.

  Option 'classifier_lock_type' can override a generic 'lock_type'
  option when a scanner is requested to classify a message. Similarly,
  a 'learner_lock_type' option can override a generic 'lock_type' when
  a scanner is invoked for auto-learning.

  Example:

  ['CRM114', 'Amavis::SpamControl::ExtProg', 'crm',
    [ qw(-u /var/amavis/home/.crm114 mailreaver.crm
         --dontstore --report_only --stats_only
         --good_threshold=8 --spam_threshold=-8) ],
    learn_ham  => [ qw(-u /var/amavis/home/.crm114 mailreaver.crm --good) ],
    learn_spam => [ qw(-u /var/amavis/home/.crm114 mailreaver.crm --spam) ],
    mail_body_size_limit => 65000, score_factor => -0.20,
    lock_file => '/var/amavis/crm114.lock',
    lock_type => 'shared', learner_lock_type => 'exclusive',
  ],

- added a global configuration setting $sa_userprefs_file (undef by
  default), which is passed on to SpamAssassin as a 'userprefs_filename'
  parameter during its initialization. If 'userprefs_filename' parameter
  is nonempty, SpamAssassin tries to load a file with that name as
  user preferences configuration file (overriding systemwide settings),
  otherwise it tries to load a file '~/.spamassassin/user_prefs'
  if it exists. Suggested by Quanah Gibson-Mount;

- added a subroutine iso8601_weekday() which takes a Unix time as an
  argument (seconds since 1970-01-01T00:00Z), and returns a weekday number
  based on local time: a number from 1 through 7, beginning with Monday and
  ending with Sunday, as specified in ISO 8601 (EN 28601).

  May be useful as a partition_tag for short-term cycling of a logging
  database storage (e.g. used by a pen-pals feature):
    $partition_tag =
      sub { my($msginfo)=@_; iso8601_weekday($msginfo->rx_time) };

- added a macro 'weekday', which expands to a weekday number
  of the current message reception time, as provided by a call
  to iso8601_weekday($msginfo->rx_time);

- added a macro 'secret_id', which expands to a secret counterpart to
  mail_id, such that: b64_encode(md5(b64_decode(secret_id))) == mail_id.
  It is encoded in base64url (RFC 4648), e.g. laL-rCJ6MBTm
  (with a counterpart mail_id: XlZbJeFhn4OE). Typically used to authorize
  releasing from a quarantine. Suggested by Antoine Nguyen;

- added a macro 'mail_id' as a synonym to a macro 'i', which is a
  long-term unique mail_id on this system, possibly used in log and in
  quarantine names, encoded in base64url (RFC 4648), e.g. XlZbJeFhn4OE
  (with a counterpart secret_id: laL-rCJ6MBTm);

- added a macro 'log_id' as a synonym to a macro 'n', which is an
  internal log id (also called task id, am_id) as shown in the log
  and by amavisd-nanny, e.g. 58725-05-2;

- added a macro 'hexenc', which encodes its string arguments as
  hex digits, high nybble first;

- added macros 'b64enc' and 'b64urlenc', which encode their arguments
  as base64 strings, removing the final null padding '=' characters.
  The 'b64enc' encodes into a character set [A-Za-z0-9+/], while the
  'b64urlenc' encodes into a character set [A-Za-z0-9-_] in accordance
  with RFC 4648;

- added a macro 'body_digest', which expands to a digest (a hash) of a
  body of a mail message as computed by the algorithm chosen by a setting
  $mail_digest_algorithm (defaults to 'MD5', can be 'SHA-1' or 'SHA-256').
  These are raw (non-encoded) bytes, not suitable for direct display.
  It is common to encode it with one of the macros: 'hexenc', 'b64enc',
  or 'b64urlenc', and possibly truncate it by a macro 'substr', e.g.:
    [:substr|[:b64urlenc|[:body_digest]]|0|9]

  The result of:
    [:hexenc|[:body_digest]]
  is the same as the result of a legacy macro call %b.

- added a configuration setting $mail_digest_algorithm which chooses an
  algorithm name for generating a mail header digest and a mail body digest.
  If set to 'MD5' (case-insensitive) a module Digest::MD5 will be used,
  producing a MD5 digest (128 bits, 32 hex digits, 22 base64 characters).
  This is the fastest algorithm and is a default. Any other value is
  passed on to a module Digest::SHA as an argument to its method new().
  The module Digest::SHA can produce digests of a SHA family: 160..512 bits,
  and accepts an algorithm name like 'SHA-1' or 'SHA-256' (see its
  documentation for details). The SHA-1 digest size is 160 bits / 40 hex /
  27 base64 chars, while the SHA-256 size is 256 bits / 64 hex / 43 base64
  characters.

  The generated digest may end up as part of a quarantine file name
  (%b in templates), or via macro 'b' or 'body_digest' in notification
  templates or a main log entry.


OTHER

- quarantining to a mbox format file was using mboxo rule for protecting
  a "From " line in a mail body, which made an original ">From " line
  indistinguishable from a protected From; now a mboxrd format rule is
  used, see http://en.wikipedia.org/wiki/Mbox

- make MIME::Parser use $TEMPBASE as a temporary directory for scratch
  files instead of its default (which was /tmp, or failing over to a
  current directory, disregarding a TMPDIR environment variable).
  This can bring performance improvements if $TEMPBASE resides on
  an SSD or RAM disk and /tmp resides on a HDD;

- distinguish an absence of an SMTP response from a negative SMTP response
  in an SMTP/LMTP client code for improved logging/debugging purposes;
  report delay time in case of a failure;

- a default value for $inet_socket_bind now reflects the availability
  of socket protocol families INET (IPv4) and INET6 (IPv6):
  - if version of Net::Server is below 2.0:    '127.0.0.1'
  - if both inet & inet6 are available:      [ '127.0.0.1', '[::1]' ]
  - if only inet is available:                 '127.0.0.1'
  - if only inet6 available (IPv6-only host):  '[::1]'
  Previously a default was always a '127.0.0.1'.

- $forward_method, $notify_method and $requeue_method now default to an IPv6
  address of a loopback interface ::1 instead of 127.0.0.1 when INET6 support
  is available and INET is unavailable (IPv6-only host);

- remove an existing Authentication-Results header field only if we are
  capable of generating our own: keep it if $enable_dkim_verification
  is false or if $allowed_added_header_fields{'authentication-results'}
  is false;

- add a field "Source-Port:" to "Abuse report format" (ARF) messages
  as per draft-kucherawy-marf-source-ports;

- Avira SAVAPI av scanner: only log a warning instead of aborting
  when a QUIT command at the end of a session fails;

- load all (both) applicable policy banks when %interface_policy contain
  both a "SOCK" entry and a Unix socket path name; and similarly when it
  contains both the "IPaddress:port" and a "port" entries. Previously
  the "SOCK" policy bank was not loaded when a socket path name entry
  existed in %interface_policy, and similarly a port-only -based policy
  bank was not loaded when a more specific "IPaddress:port" entry existed;

- make use of a new SpamAssassin 3.4.0 option "skip_prng_reseeding"
  (description in the SpamAssassin Bug 6690);

- no longer pre-load a module Mail::SpamAssassin::Plugin::SpamCop
  to avoid unnecessarily dragging-in modules Net::SMTP and Net::Cmd;

- a spamd client code in Amavis::SpamControl::SpamdClient now obeys an
  option 'mail_body_size_limit' in a @spam_scanners entry and truncates
  a message passed to spamd (like other spam scanner interfaces do),
  instead of skipping a call to spamd. This interface module is mainly
  intended for testing spamd, or used with third-party software which
  uses the same spamc/spamd protocol.

- modules Convert::TNEF is now made optional, instead of being required;
  do not load it if @decoders list is empty;

- avoid a warning issued when encountering an empty ehlo-keyword in a
  response to an EHLO command (like on testing with a smtp-sink utility);

- some fine-grained reduction in a number of generated opcodes and
  similar tiny optimizations; this accounts for numerous small changes
  in the code;

- avoid some warnings issued by Test::Perl::Critic;

- just in case: make sure that our SMTP responses at the incoming session
  are truly flushed to the socket and not stuck in a perlio I/O buffer;

- updated 2.7.0 release notes, documenting that a policy bank may also be
  loaded based on a path name of a Unix socket receiving a connection;

- updated and clarified schema and instructions in README.sql-pg
  based on suggested changes by Tim Howe;

- fixed spelling mistakes in comments;

- internal incompatible change: changed arguments and a result of a
  subroutine write_header; also, now it rewinds a message file by itself;


---------------------------------------------------------------------------
                                                            August xx, 2012
amavisd-new-2.7.3 release notes

BUG FIXES

- fixed a bug in the SMTP client code, where the final SMTP status did
  not reflect a failure status of a DATA command from a back-end MTA.
  This caused a reception of a mail message to be confirmed but a message
  was then lost, as it could not be passed to a back-end MTA. The bug
  went unnoticed for years, as the commonly used MTA normally reject
  either at the MAIL FROM, RCPT TO or at the data-dot stage, but not
  at the DATA command. Reported by Deniska-rediska;

- if a configuration file path as given through a command line option -c
  or as an argument to include_config_files() was not an absolute path,
  and that file contained an error, the do() would search the @INC list
  for alternative files of the same name, and report an unrelated error
  (typically: No such file or directory) instead of reporting the true
  reason for a failure;

- fixed a regular expression in amavisd.conf for an 'Avast!' AV entry
  to properly extract a virus name; a patch by Ralf Hildebrandt;

OTHER

- updated an AV entry for a Sophos Anti Virus: the scanning program
  used to be named 'sweep', now it is 'savscan'; thanks to mefiX;

- documentation update: remove vestiges of a field 'spam_modifies_subj'
  in README.sql, README.sql-mysql, this field was obsoleted in 2.7.0;
  thanks to Patrick Ben Koetter;


---------------------------------------------------------------------------
                                                              June 30, 2012
amavisd-new-2.7.2 release notes

BUG FIXES

- a generated Received header field was missing the 'IPv6:' prefix
  in the TCP-info component of a 'by' subfield (as required by RFC 5321,
  section 4.1.3) when amavisd received a message over an IPv6 protocol;
  (btw, the TCP-info component of a 'from' subfield was correct);

- changed data type of an SNMP variable LogRetries from C32 to C64
  for consistency with the MIB;

- updated AV entry 'AVG Anti-Virus' to consider status 403 continuation
  lines when searching for a virus name; suggested by Ralf Hildebrandt;


OTHER

- reduce a log level to 5 on a log message:
    Amavis::IO::RW: Error flushing on close: ...
  to avoid an innocent but sinister-looking warning when a pipe
  to a virus scanner is broken and needs to be re-established;
  reported by Stefan Jakobs;

- updated an AV entry for 'F-Secure Linux Security' to version 9.14;
  options updated by Mika Ilmaranta, a patch by Tuomo Soini;

- fix a Unix socket compatibility issue with Net::Server versions 2.000,
  2.001 and 2.002, where a method NS_unix_path no longer exists.
  This method was re-introduced for compatibility reasons in 2.003.
  Reported by Paul MacKenzie;


---------------------------------------------------------------------------
                                                             April 29, 2012
amavisd-new-2.7.1 release notes

BUG FIXES

- prevent rmdir() from failing with 'Invalid argument' on Solaris 10 when
  deleting a temporary directory: current working directory must not be
  within a directory which is about to be deleted; reported and diagnosed
  by Maciej Uhlig;

- forwarding or quarantining through a 'pipe:' method failed with
  "Insecure dependency in exec while running with -T switch" when a
  sendmail command-line option -N was needed; reported by Andreas Schulze;

- when multiple sockets are specified (e.g. in $forward_method) as a
  redundancy/failover mechanism, and SMTP session caching is enabled,
  a failed forwarding session does not clear a cached session, so all
  further attempts are stuck with the failed server, instead of picking
  a different server from the list; discovered by Michael Storz;

- on establishing a SMTP session when multiple sockets are specified
  (e.g. in $forward_method) as a redundancy/failover mechanism, the
  random choice never picked the last socket in a list;
  discovered by Michael Storz;

- fix defanging by mimedefang, it was failing with perl 5.10 or later
  due to an unhandled "Insecure dependency in sprintf" while logging the
  result if the $log_level was 2 or higher, or when debugging was enabled;
  thanks to Steve Scotter for a problem report;

- fix defanging by Anomy::Sanitizer, it was failing with an error message:
  "mangling by anomy failed: replacement size 0, mail will pass unmodified";

- fix the 'xz' entry in a default @decoders list (in files amavisd.conf,
  amavisd.conf-default and amavisd); the first two variants ('xzdec' and
  'xz') were glued together, so the xz decoder was only available if found
  under names 'unxz' or 'xzcat';

- provide a workaround for a bug [rt.cpan.org #64642] [rt.cpan.org #84879]
  in a perl module Encode, which gratuitously untaints a string when encoding
  or decoding it:
    https://rt.cpan.org/Public/Bug/Display.html?id=64642
    https://rt.cpan.org/Ticket/Display.html?id=84879
     (fixed in Encode 2.50);
  A module Scalar::Util is now required, which should not be a compatibility
  problem, as this module is a Perl core module since perl 5.8.0.

- avoid the use of Encode::is_utf8 due to a bug in a perl module Encode
  as bundled with versions of Perl 5.8.0 to 5.8.8 (fixed in March 2007):

  Perl bug tracking: #32687:
    Encode::is_utf8 on tainted UTF8 string returns false
    https://rt.perl.org/rt3/Public/Bug/Display.html?id=32687
  also referenced by #37170:
    https://rt.perl.org/rt3/Public/Bug/Display.html?id=37170

  This is a re-manifestation of the same problem we had back in 2004,
  with a workaround provided by amavisd-new-2.2.1.  Forgot that people
  are still using Perl 5.8 :)  Reported by Peter Dieth;

- fix a warning: _WARN: Invalid conversion in sprintf: "%a"

- write informational messages during a stop/start/restart to stdout,
  instead of to stderr, avoiding unnecessary cron job messages;
  thanks to Cristian Seres, Sandro Janke and John Griffiths;
  also: https://bugzilla.redhat.com/show_bug.cgi?id=561389

- fix a syntactically incorrect 'Avira SAVAPI' av entry (missing
  closing bracket) in a sample configuration file amavisd.conf;

- minor: get_body_digest incorrectly logged 8-bit body as 8-bit header;

- no longer insist on a minimal version 2.22 of a module Digest::MD5,
  the 'clone' method is no longer needed since amavisd-new-2.7.0;

- do not call $parser->max_parts($MAXFILES) with some old versions
  of MIME::Parser which did not yet provide this method;

- pre-load a module File::Glob even with perl 5.8.0, otherwise
  autowhitelisting in SpamAssasssin may fail with "Insecure dependency";

- documentation: (files README.sql-mysql and README.sql-pg):
  fixed a field name "policy.unchecked_lover", previously incorrectly
  specified as "policy.unchecked_lovers_maps"; reported by TimH;

- documentation: fixed the two SELECT examples in files README.sql-pg and
  README.sql-mysql, the field 'select' needs to be qualified with a table
  name: 'msgrcpt.content' to avoid ambiguity;  reported by Gary V;

- documentation bug in amavisd.conf-default: 'ESMTP' is not a valid
  setting for $protocol, just use 'SMTP' instead; reported by Pascal Volk;


COMPATIBILITY

- commented out the LHA entry in the default @decoders list and in
  do_executable(). The program seems to be unmaintained, was seen crashing
  and as such it may pose a security risk; pointed out by Thomas Jarosch;

- due to popular demand, bring the 'spam-tag:' log line back to log level 2
  (version 2.7.0 dropped it to log level 3) to retain compatibility with
  some log analyzers. Caveat: 'spam-tag' string is now entirely in lowercase.
  Suggested by Stefan Jakobs;


OTHER

- if a message is quarantined to more than one location using different
  quarantine methods, the SQL field msgs.quar_type indicates only the
  type of the last one. When archival quarantining is enabled this choice
  is unfortunate, as the primary quarantine type is more interesting
  than the permanent archival quarantine type. This is now reversed,
  the msgs.quar_type field now reflects the first quarantine type.
  Suggested by Patrick Ben Koetter.

- SMTP session caching now no longer re-uses old sessions which are
  in use for more than a minute since their establishment; suggested
  by Michael Storz;

- having the archive quarantine enabled should not be a sufficient reason
  to store information to SQL when $sql_store_info_for_all_msgs is off;
  Suggested by Patrick Ben Koetter.

- ClamAV-clamd and ClamAV-clamd-stream av scanners: changed socket name
  in a sample configuration file amavisd.conf to /var/run/clamav/clamd.sock
  (previously the socket name was /var/run/clamav/clamd); this makes it
  compatible with a default socket name under several Linux distributions
  and under FreeBSD; suggested by Oliver Schinagl;

- documentation updates;


---------------------------------------------------------------------------
                                                               July 1, 2011
amavisd-new-2.7.0 release notes

Contents:
  NEW FEATURES SUMMARY
  GENERAL
  COMPATIBILITY WITH 2.6.4 / 2.6.5 / 2.6.6
  BUG FIXES SINCE 2.6.6
  BUG FIXES SINCE 2.6.5
  BUG FIXES SINCE 2.6.4
  NEW FEATURES
  OPTIMIZATIONS
  OTHER
  CLEANING


NEW FEATURES SUMMARY

- significant improvements affecting a pre-queue content filtering setup
  (time limiting, warm/flying restart, ...) - requires Postfix 2.7.0 and
  SpamAssassin 3.3.0, or later;

- new daemon amavisd-signer makes it possible to sign mail with DKIM
  signatures without requiring amavisd process to have access to private
  signing keys;

- added support for the Sophos-SSSP, Avira SAVAPI and ClamAV clamd streaming
  protocols allows amavisd to communicate with these antivirus solutions;

- allow specifying multiple (fail-over) back-end mailers for resubmission
  of messages from amavisd back to MTA;

- support for Postfix 2.8.0 XFORWARD IDENT, passes a local message identifier
  (queue id) downstream to a post-queue content filter and back to Postfix;

- speedup in data transfer rate on receiving large mail via SMTP/LMTP
  sessions by a factor of 3.9 for plain text sessions, and by a factor
  of 11 for encrypted (TLS) sessions;

- recognize and insert header fields as prepared by SpamAssassin 3.3.0
  or later through its 'add_header' configuration option;

- a new setting allows a forward_method to be chosen based on a message
  content type and/or recipient address; this may be useful for outgoing
  mail routing purposes or to implement sender reputation schemes;

- per-recipient (or per- policy bank) SpamAssassin configuration files or
  SQL configuration sets are supported (@sa_userconf_maps), and per-recipient
  SQL Bayes database usernames (@sa_username_maps);

- new macros: client_helo, client_addr, client_port, client_addr_port,
  mime2utf8, rusage, ADDEDHEADERHAM, ADDEDHEADERSPAM, banned_parts_as_attr,
  actions_performed, new arguments to macros dkim, header_field, HEADER,
  YESNO and YESNOCAPS;

- @listen_sockets setting offers a unified configuration of listening
  sockets; it may be configured directly, or the traditional way: the
  $inet_socket_port, $unix_socketname and $inet_socket_bind just add
  their entries to the @listen_sockets list;

- lists of lookup tables (the @*_maps variables) can now contain
  explicit SQL and LDAP lookup objects as their elements, instead of
  (or in addition to) the implied SQL and LDAP lookups;

- a new configuration variable @virus_name_to_policy_bank_maps allows
  loading of policy banks based on a virus name;

- a new configuration variable $mail_id_size_bits allows setting the size
  of randomly generated mail_id and secret_id codes;

- a new configuration variable $sql_store_info_for_all_msgs allows storing
  information on mail messages selectively just for quarantined messages;

- added SNMP counters InMsgsStatus* which combine the final mail checking
  status with a direction of a mail flow;

- optional transparent archival quarantine, retaining envelope recipient
  addresses on delivery to a dedicated SMTP server;


GENERAL

With a synergy of four solutions, using amavisd-new in a pre-queue
filtering setup became a sensible / better behaved solution:

- the "smtpd_proxy_options=speed_adjust" Postfix option, available since
  Postfix 2.7.0 (20091101), improves decoupling between SMTP clients
  and a content filter in a proxy setup, reducing the number of content
  filtering processes needed for the same mail load. With this option
  turned on, a Postfix SMTP server receives entire message before
  connecting to a before-queue content filter;

- a master_deadline option and its API equivalent, available in SpamAssassin
  since version 3.3.0, allows for time limiting on lengthy rules checking,
  while still providing results when a time limit is exceeded; this makes
  it more suitable for time-sensitive setups like a pre-queue filtering setup;

- reworked sub-task time limiting in amavisd, along with its counterpart
  solution in SpamAssassin, makes it better suited to a real-time nature
  of pre-queue filtering setups where one has no control over how long
  SMTP clients are willing to wait at the data-end stage;

- a re-purposed command line option 'reload' now does a warm restart,
  keeping sockets available to an MTA client at all times, thus reducing
  a chance that an MTA would even notice a content filter's warm restart.

Provided that required minimal versions of Postfix and SpamAssassin are
available, on can try amavisd in a Postfix proxy setup. The $child_timeout
setting needs to be radically reduced in this setup, matching the longest
time most SMTP clients are willing to wait, and must be less than Postfix
is willing to wait (smtpd_proxy_timeout), which by default is 100 s.
A sensible value is somewhat less then a minute (e.g. 45 seconds). Even
though RFC 5321 (section 4.5.3.2.6) recommends that clients SHOULD be
willing to wait for 10 minutes at data-end stage, it is not uncommon
that this recommendation is not adhered to.

Note that a pre-queue filtering setup (along with its benefits) still
has all its drawbacks, like the need for more filtering processes to
accommodate mail arrival rate peaks (instead of averages), and much shorter
and unpredictable (client-dependent) time limits. The new features of the
three products only rise the thresholds where trouble starts, and make
the whole setup better behaved.


COMPATIBILITY WITH 2.6.4 / 2.6.5 / 2.6.6

- due to popular demand to reduce undesired and unintentional backscatter,
  defaults for the settings $final_spam_destiny and $final_banned_destiny
  were changed. Previously they both defaulted to D_BOUNCE, new defaults
  are:

    $final_virus_destiny      = D_DISCARD;
    $final_banned_destiny     = D_DISCARD;
    $final_spam_destiny       = D_PASS;
    $final_bad_header_destiny = D_PASS;

  Please adjust to will. If you have these settings configured explicitly
  in a configuration file, this change of a default value does not affect
  you.

  For a pre-queue content filtering setup (smtp proxy or milter) a suitable
  value for undesired content is D_REJECT. For a post-queue filtering setup
  preferred choices are to tag-and-deliver (D_PASS), or to drop (D_DISCARD)
  and quarantine.

  It is still possible to use a D_BOUNCE setting, but please limit
  and monitor your backscatter. Due to a default setting of
  @viruses_that_fake_sender_maps the backscatter on viruses has been
  fully suppressed since amavisd-new-20021116 even with a D_BOUNCE.
  Backscatter on high-scoring spam has been controllable since
  amavisd-new-20030616-p8 by a family of settings
  @spam(_crediblefrom)_dsn_cutoff_level(_bysender)_maps,

- several ancient configuration settings were removed or deactivated,
  see section CLEANING below;

- a command line option 'reload' has been renamed to 'restart',
  corresponding to a shutdown followed by a normal (cold) start;
  while a command line option 'reload' has been re-purposed to function
  as a warm/flying restart. See below for details. Protection of some
  files may need to be examined (configurations files and DKIM private
  keys should be readable for group vscan/amavis and not writable by
  UID vscan/amavis);

- a failure of all virus scanners no longer automatically tempfails the
  operation, but flags a message with a CC_UNCHECKED contents category
  (just like a failure of decoders/dearchivers), and allows the usual
  controls (*_destiny, *_quarantine_*) to be used to choose behaviour.
  The $virus_scanners_failure_is_fatal=1 reverts to previous behaviour,
  see below;

- a default value of $hdr_encoding and $bdy_encoding has been changed
  from 'iso-8859-1' to 'UTF-8' which better suits reporting of banned parts;

- default encoding for reading text templates from the tail of a file
  'amavisd' has been changed to 'utf8', which allows replacing a default
  text by a non-ascii Unicode template, encoded as UTF-8;

- when using SQL for logging/penpals: three fields need to be added
  to a table msgrcpt: msgrcpt.content, msgrcpt.rseqnum, msgrcpt.is_local,
  and one to a table msgs: msgs.originating .

  Semantics of msgrcpt.content is similar to msgs.content, but reflects
  individual recipient's settings (e.g. when a message is both banned and
  spam, a recipient with banning tests disabled will see a message as spam,
  while other recipient of the same message will consider it banned).
  The added field may also simplify queries by third party applications.

  The field msgrcpt.rseqnum uniquely identifies/enumerates recipients within
  each message, typically by assigning them sequential numbers starting
  with 1. The only purpose of this field is to make it possible to define
  a primary key for the table msgrcpt, which may be needed for some
  clustering/partitioning purposes. Amavisd itself does not require a
  primary key on this table.

  The field msgrcpt.is_local should be considered a boolean, its value can be:
    'Y' ... yes, recipient is local, i.e. matches @local_domains_maps
    'N' ... no,  recipient does not match @local_domains_maps
    ' ' ... unknown - this is a default field value; amavisd always sets
            this field to either 'Y' or 'N';

  The field msgs.originating should be considered a boolean, its value can be:
    'Y' ... yes, message is originating from inside or from an authenticated
            roaming sender (the flag $originating was true);
    'N' ... no, message is not submitted by our user ($originating was false);
    ' ' ... unknown - this is a default field value; amavisd always sets
            this field to either 'Y' or 'N', reflecting the $originating flag;

  A combination of msgs.originating and msgrcpt.is_local tells a direction
  a message is traveling:
    originating is_local
        N        N    open relay (probably misconfigured @local_domains_maps
                                  or $originating flag not set)
        N        Y    inbound message
        Y        N    outbound message
        Y        Y    internal message (inside or authenticated -> inside)
  Note that a direction is a per-recipient property, a multi-recipient
  message can be outbound for some recipients and internal for others
  at the same time.

  The following SQL directives can be used to add these new fields:
    ALTER TABLE msgrcpt ADD rseqnum     integer  DEFAULT 0   NOT NULL;
    ALTER TABLE msgrcpt ADD content     char(1)  DEFAULT ' ' NOT NULL;
    ALTER TABLE msgrcpt ADD is_local    char(1)  DEFAULT ' ' NOT NULL;
    ALTER TABLE msgs    ADD originating char(1)  DEFAULT ' ' NOT NULL;

  If a primary key on table msgrcpt is needed for some reason,
  try something like the following:
  *MySQL:
     UPDATE msgrcpt SET rseqnum=1+floor(999999999*rand()) WHERE rseqnum=0;
     ALTER TABLE msgrcpt ADD PRIMARY KEY (partition_tag,mail_id,rseqnum);
  *PostgreSQL:
     UPDATE msgrcpt SET rseqnum=1+floor(999999999*random()) WHERE rseqnum=0;
     CREATE UNIQUE INDEX msgrcpt_idx_primary
       ON msgrcpt (partition_tag,mail_id,rseqnum);

  If keeping a possibly customized copy of %sql_clause in a configuration
  file, entries 'ins_rcp' and 'upd_msg' will need to be updated accordingly.

  To facilitate transition from 2.6.6 to 2.7.0, it is possible to configure
  amavisd 2.7.0 to supply with SELECT and INSERT clauses a subset of
  parameters as used by 2.6.6. A configuration setting $sql_schema_version
  controls this backward compatibility. Its default value is 2.007000 .
  By setting it to a value below 2.007000 (such as 2.006006 or 2.006004) a
  subset of parameters as was used with a version 2.6.6 or 2.6.4 is selected.
  SQL clauses in $sql_clause{'upd_msg'} and $sql_clause{'ins_rcp'} need to
  be adjusted according to a chosen version of actual parameters. Below is
  an example of a required setting compatible with both amavisd-new 2.6.6
  and 2.7.0, which lets amavisd 2.7.0 use an SQL schema of 2.6.6, which
  lacks the four newly added fields:

  our($sql_schema_version)  if $myversion_id_numeric < 2.007000;
  $sql_schema_version = 2.006006;
  $sql_clause{'upd_msg'} =
    'UPDATE msgs SET content=?, quar_type=?, quar_loc=?, dsn_sent=?,'.
    ' spam_level=?, message_id=?, from_addr=?, subject=?, client_addr=?'.
    ' WHERE partition_tag=? AND mail_id=?';
  $sql_clause{'ins_rcp'} =
    'INSERT INTO msgrcpt (partition_tag, mail_id, rid,'.
    ' ds, rs, bl, wl, bspam_level, smtp_resp) VALUES (?,?,?,?,?,?,?,?,?)';

  Note that this is only provided to facilitate transition. Please add
  the new fields on an opportunity, then remove the above settings from
  your configuration file and restart amavisd.

- SQL fields msgs.content and msgrcpt.content used to encode a content
  type CC_SPAMMY as 's', and CC_MTA as 't'. With default case-insensitive
  queries on a data type CHAR it was not possible to distinguish
  between lowercase 's' (= CC_SPAMMY) and uppercase 'S' (= CC_SPAM), so
  the CC_SPAMMY is now encoded as 'Y', and CC_MTA as 'T' (just in case).
  Please adjust your management tools if necessary.

- please check SQL data types on fields msgs.mail_id, msgs.secret_id,
  msgrcpt.mail_id and quarantine.mail_id in existing databases, these must
  be treated case-insensitively - see details further down, please search
  further down for "must be treated case-insensitively";

- SQL clause $sql_clause{'sel_quar'} no longer uses a coalesce() function
  (introduced in amavisd-new-2.6.2) which attempted to deal with NULL
  quarantine.partition_tag or with undefined $partition_tag, when releasing
  a message from an SQL quarantine - but payed the price of not using an
  index. If releasing from an SQL quarantine is desired, either ensure there
  are no (old) records in a table 'quarantine' with a NULL partition_tag
  (e.g. replace such fields with a 0, and don't leave $partition_tag
  undefined in amavisd.conf - set it to 0 for example when partitioning
  is not needed), or assign a former clause to $sql_clause{'sel_quar'}
  in amavisd.conf :

  $sql_clause{'sel_quar'} =
    'SELECT mail_text FROM quarantine'.
    ' WHERE coalesce(partition_tag,0)=coalesce(?,0) AND mail_id=?'.
    ' ORDER BY chunk_ind';

  Thanks to Michael Scheidell and Thomas Gelf for pointing out the
  inefficiency.

- if using Petr Rehor's amavisd-milter to call amavisd, please update it
  to version 1.5.0 (or later), as earlier versions did not accept a new
  attribute 'log_id', which is now included in a response from amavisd;

- a sample configuration file amavisd.conf-sample was removed from the
  package - it hasn't been seriously updated for years, and it contained
  lots of aged or distracting information;

- old helper programs amavis.c and amavis-milter.c are no longer distributed
  with the package, along with the entire helper-progs subdirectory.
  As a milter client please use the more modern 'amavisd-milter' package by
  Petr Rehor, available at http://sourceforge.net/projects/amavisd-milter/

- old AM.CL protocol is no longer supported; it was provided for
  compatibility with versions of AMaViS pre-dating amavisd-new, along with
  its client programs: old helper programs amavis.c and amavis-milter.c.
  Handling of release requests and milter requests through AM.PDP protocol
  remains unaffected;

- a sample AM.PDP client program for mail submission to amavisd which was
  previously distributed as 'helper-progs/amavis.pl' has been renamed to
  'amavisd-submit' and slightly modernized. It provides partial functional
  compatibility with a very early AMaViS client program amavis.c . It takes
  a message on stdin, copies it to a temporary file, passes its name to
  amavisd daemon using AM.PDP protocol, and based on the response adjusts
  its exit status value so that an invoking script or program may decide
  whether to deliver the mail message or not;

- mail_id and secret_id are now composed of characters from a character set
  [ A-Z, a-z, 0-9, -, _ ] instead of [ A-Z, a-z, 0-9, +, - ]  (i.e. now uses
  underline instead of a plus) to conform to RFC 4648 base64url specification,
  thus making it potentially easier to specify an id in various GUI/API
  interfaces without a need for quoting a plus. The change is also reflected
  in a choice of quarantine file names. Compatibility with releasing of old
  quarantined messages is retained;

- relationship between mail_id and secret_id has changed and is now:
    mail_id = encode_base64(md5(decode_base64(secret_id)))
    (i.e. md5 is applied to 9 raw bytes of a secret id)
  while previously it was:
    mail_id = encode_base64(md5(secret_id))
    (i.e. md5 was applied to 12 base64 characters of a secret id)
  Releasing from a quarantine still understands old relationship and old
  base64 encoding character set for compatibility, so no problems are
  expected even when releasing a mix of old and new quarantined messages.
  The change may potentially affect some third party application.

- caching of virus and spam check results based on a mail body hash has been
  removed. It was very beneficial years ago when virus storms were common
  and spam was not personalized. Nowadays (2011) the feature barely pays
  for itself (savings are comparable to additional processing needed), and
  is incompatible with per-recipient spam checks (as introduced with this
  version), and incompatible with DKIM verification on locally originating
  and signed mail being returned from a mailing list. Rather than trying
  to fit a square peg into a round hole, the feature is now dropped.

  Associated configuration variables are still declared for compatibility,
  but have no effect:
    $enable_global_cache,
    $virus_check_negative_ttl, $virus_check_positive_ttl,
    $spam_check_negative_ttl, $spam_check_positive_ttl

- a default value for $lock_file is now undefined instead of the former
  default value "$helpers_home/amavisd.lock";  an undefined value lets
  Net::Server choose a suitable temporary file (POSIX::tmpnam) for 'flock'
  serialization on socket accept();

- updated (rarely used) AV entries 'Sophos SAVI', 'Mail::ClamAV'
  and 'av_smtp' in an incompatible way (they now use ask_daemon interface
  instead of a dedicated subroutine), please update your AV entries
  according to the new sample file amavisd.conf;

- internal: spam_level() and spam_tests() are no longer properties of a
  message but are now a property of each recipient, which makes possible
  per-recipient spam checking settings (e.g. rules, bayes username, ...);

- internal: a delivery_method() is no longer a property of a message, but
  is now a property of each recipient, which makes per-recipient forwarding
  possible;

- internal: a load_policy_bank() takes one additional argument $msginfo,
  which is passed on to any policy bank's ACTION routine if a policy bank
  has one;


BUG FIXES SINCE 2.6.6

- take a more cautious approach on keeping evidence on an SMTP session
  transaction state when feeding a message back to MTA. Under certain
  abnormal circumstances an MTA could respond to end-of-data with a temporary
  failure but retain an active transaction state while amavisd would assume
  the transaction was closed, leading to a 'MAIL transaction in progress'
  failure on the next message using the same cached SMTP session.
  Now amavisd considers a transaction state to be unknown when there is any
  doubt and closes a session instead of caching it, unless the transaction
  is reliably known to be closed. Problem reported by Ralf Hildebrandt.


BUG FIXES SINCE 2.6.5

All bug fixes that were developed during a 2.7.0 developement cycle
have been backported to the 2.6 branch and released as 2.6.6.
They are all documented in release notes of the 2.6.6 release.


BUG FIXES SINCE 2.6.4

All bug fixes and some compatibility measures that were developed during
a 2.7.0 developement cycle have been backported to the 2.6 branch and
released as 2.6.5. They are all documented in release notes of the
2.6.5 release.


NEW FEATURES

- a command line option 'reload' has been renamed to 'restart', while keeping
  its semantics: to stop a currently running daemon, and then promote a
  process to become a new daemon. This makes a complete and independent
  restart with all its benefits: can start a chrooted daemon, can access
  config files or DKIM signing keys accessible only to root, can open
  sockets/ports otherwise restricted to root, can change inet and unix
  socket locations, their bindings and port numbers. It will also reset
  SNMP counters in a database, if it is enabled.

  A downside is that during a restart existing sockets are closed, so
  until new sockets are re-established an MTA client experiences connection
  failures, which is particularly disruptive in a pre-queue MTA setup.

- a command line option 'reload' has been re-purposed to function as a
  warm restart: it now sends a HUP signal to a running daemon, then exits.
  A running daemon upon receiving a HUP signal will clone its sockets,
  clear their 'close-on-exec' flag, then restart itself through exec().
  A reborn daemon inherits open sockets, does a normal startup (loading
  perl modules and config files), then reassociates inherited sockets
  with configured inet and Unix socket names, which is why these must
  not be changed in a configuration file between reloads.

  Sockets remain open and available to clients during the whole warm-restart
  period, requests are queued by kernel (queue size is configurable through
  $listen_queue_size, defaulting to SOMAXCONN, or there may not be any
  queues at all when an IP stack is using SYN cookies), so apart from a
  delay in connection establishment, an MTA client will not notice a restart
  as long as the IP stack is willing to accept new sessions (as controlled
  by listen queue size or SYN cookies). This makes the reloading method
  particularly suitable for pre-queue filter setups.

  A downside is that a HUP-ed daemon has already dropped root privileges
  during its first start, so it must restart as a nonprivileged user
  (typically 'vscan' or 'amavis'), which rules out its ability to chroot,
  and requires that configuration files, DKIM signing keys files, and
  perl modules must be readable by this GID or UID, otherwise a restart
  fails and a daemon process no longer exists. Depending on a version
  of perl and operating system in use, it might be necessary to specify
  an absolute path to amavisd on the initial start. To debug warm-restart
  problems it may be useful to first try a warm restart on a non-daemonized
  process (started manually as: amavisd foreground, or: amavisd debug),
  so that potential errors on stderr are visible.

  A sensible protection of configuration files and files with DKIM keys is
  to set their group ownership to vscan (amavis) and UID ownership to root,
  and mode to 0640 (u=rw,g=r,o=).

  A need for non-root accessibility of DKIM signing keys can be avoided
  by using a new signing service daemon included with this release (see
  further down: amavisd-signer).

  One additional feature of a warm reload is that SNMP counters in a
  database (visible through amavisd-agent or amavisd-snmp-subagent)
  are not reset to zero, unlike the restart which clears them.

- on stop, restart or reload, currently busy child processes are left
  to complete their current task instead of being abruptly stopped.
  This minimizes a disruption experienced by MTA.

- added a client-side and server-side support for the IDENT attribute of
  a Postfix XFORWARD smtp command (available since Postfix version 2.8.0).
  The attribute allows passing of a local message identifier (MTA queue id)
  downstream from a front-end MTA to a post-queue content filter and back
  to a back-end MTA. Amavisd makes this information available through an
  existing macro %Q (which was previously non-empty only in milter setups),
  and as such the information appears in the log when using a default amavisd
  log template. This information is also passed back to a re-entry MTA if
  it announces a support for this attribute (enabled on a back-end smtpd
  service with an option smtpd_authorized_xforward_hosts), so the log entries
  are now easier to correlate in a post-queue filtering setup:

  back-end MTA:
    postfix/smtpd[72995]: 553261D1CB0: client=localhost[::1],
      orig_queue_id=2F5971D1CA3, orig_client=...

  post-queue content filter:
    amavis[20341]: (20341-15) Passed CLEAN ...
      Queue-ID: 2F5971D1CA3, queued_as: 553261D1CB0

  front-end MTA:
    postfix/lmtp[73130]: 2F5971D1CA3: ... relay=127.0.0.1[127.0.0.1]:10024,
      status=sent (250 2.0.0 from MTA(smtp:[::1]:10025):
                   250 2.0.0 Ok: queued as 553261D1CB0)

- support Postfix 2.9 long queue IDs (enable_long_queue_ids=yes)
  as available since postfix-20110321 by adjusted default values
  of $log_short_templ and $log_verbose_templ templates;

- improved support for pre-queue content filtering setups: reorganized time
  limiting on processing to obey more strictly a deadline time, which is the
  sum of $child_timeout and a timestamp at the moment of a reception of a
  complete message (SMTP data-end time). The deadline time is also passed
  to SpamAssassin, which since version 3.3.0 supports a 'master_deadline'
  option and can gracefully terminate its processing on a time limit, while
  still providing results collected so far.

  The setting $sa_timeout is now retired: the variable is still declared
  for backward compatibility, but has no effect. Instead, the time available
  for spam scanning is automatically determined from $child_timeout, taking
  into consideration the actual time left till the deadline;

- $child_timeout and $smtpd_timeout settings are now dynamic, i.e. can be
  changed by a policy bank, which makes it possible to support (on different
  ports) both the pre-queue and post-queue (e.g. fallback) clients by the
  same amavisd daemon;

- a new configuration variable $soft_bounce (also a member of policy banks)
  turns rejects, bounces and discards into a temporary failure when true;
  this is potentially useful as a short-term safety net when testing
  configuration changes on a low-traffic server;

- added an AV entry and supporting code for Sophos-SSSP, implementing the
  client side of the Sophos SSSP protocol, talking to a savdid daemon
  (a replacement for Sophie) using its native protocol;

- added an AV entry and supporting code for AVIRA SAVAPI protocol,
  implementing the client side of the protocol, talking to a savapi daemon;

- added an AV entry for clamdscan which can serve as a useful backup scanner,
  connecting as client to a remote clamd; the supplied alternative config
  file should specify the host IP and port number where clamd is running
  using TCPAddr and TCPSocket options; suggested by Michael Scheidell;

- added an AV entry for ClamAV clamd streaming which can serve as a main
  or backup scanner, connecting as client to a remote clamd. The client
  side implements clamd zINSTREAM command, batched in a zIDSESSION / zEND
  group. This approach is comparable to what is implemented in clamdscan
  and is somewhat less efficient than passing only a directory name to
  clamd, but has an advantage that the clamd daemon need not have direct
  access to amavisd temporary files, and may even be running on a remote
  host. The cost of this flexibility is additional data transfer.
  Suggested by Michael Scheidell.

- lists of lookup tables (the @*_maps variables) can now contain
  explicit SQL and LDAP lookup objects as their elements, instead of
  (or in addition to) the implied SQL and LDAP lookups.

  A new configuration setting $lookup_maps_imply_sql_and_ldap controls
  whether the SQL and LDAP lookup objects are implicitly prepended
  to list in @*_maps variables (when true), or not (when false).
  The default value is 1 for compatibility with previous versions.

  Regardless of the $lookup_maps_imply_sql_and_ldap setting, the @*_maps
  lists of lookup tables/objects may now contain explicit lookup objects
  for arbitrarily named SQL fields and LDAP attributes. This provides more
  flexibility: the order of lookups is now configurable (previously SQL and
  LDAP lookup objects were prepended to lists and thus always looked up
  first), and the names of SQL fields or LDAP attributes can now be
  specified as arguments to SQL and LDAP lookup objects (previously field
  and attribute names were hardwired into code).

  Three shorthand functions are available for creating SQL lookup (query)
  objects: q_sql_s, q_sql_n, q_sql_b, and three for creating LDAP lookup
  (query) objects: q_ldap_s, q_ldap_n, q_ldap_b.  The _s, _n and _b suffixes
  imply a data type of the expected result: a string, a numeric value, and a
  boolean. Due to Perl's forgiveness a string data type can in most cases be
  used as a number or as a boolean and may be used when data type conversion
  and value normalization is not necessary or when a data type is not known.

  Here are some examples:

  @spam_kill_level_maps = (
    { # a hash-type lookup object
      'user1@example.com' => 8,
      '.example.org' => 7.5,
    },
    q_ldap_n('amavisSpamKillLevel'),  # an LDAP lookup object
    q_sql_n('spam_kill_level'),  # an SQL lookup object
    $sa_kill_level_deflt,  # a constant-type pseudo-lookup object
  );

  @spam_subject_tag2_maps = (
    q_sql_s('subject_tag'),
  );

  In addition to simple scalar arguments (a field or attribute name), these
  six lookup object-creating functions can take as their argument a listref
  of field or attribute names, or a hashref where hash entry values are
  SQL field names (or LDAP attribute names), and hash entry keys are the
  result data names. Lookups resulting from such lookup objects will return
  a hashref of key/value pairs instead of a single scalar result. This is
  currently only useful in the @dkim_signature_options_bysender_maps list
  of lookups which expects such hash results (sets of data names and their
  values, i.e. entire records).

  The listref argument is just a shorthand notation which can be used
  in place of a hashref when field names (or attribute names) are the
  same as the desired result data names. The following alternatives
  are equivalent:
    q_sql_s( { 'd' => 'd', 's' => 's', 'ttl' => 'ttl' } )
    q_sql_s( {  d  => 'd',  s  => 's',  ttl  => 'ttl' } )  # perl shorthand
    q_sql_s( [ 'd', 's', 'ttl' ] )
    q_sql_s( [qw(d s ttl)] )  # perl shorthand

  Example (artificial, not necessarily useful):

    @dkim_signature_options_bysender_maps = (
      q_sql_s(  ['d', 's', 'ttl'] ),
      q_ldap_s( ['d', 's', 'a'] ),
      q_ldap_s({ d => 'sdid', s => 'amavisSelector', a => 'amavisDkimAlg' }),
      { 'postmaster@example.com' => { a => 'rsa-sha1', ttl => 7*24*3600 },
        '.' => { a => 'rsa-sha256', ttl => 30*24*3600 },
      },
    );

- a new configuration variable $sql_store_info_for_all_msgs when turned
  off requests storing information on mail messages selectively just for
  quarantined messages. At the same time turning this setting off also
  disables pen pals lookups. A default value is 1 (true) as before,
  indicating that information on all messages is to be stored into tables
  msgs, msgrcpt and maddr when @storage_sql_dsn is enabled, thus ensuring
  long-term uniqueness of mail_id and proper operation of pen pals lookups;

- a new program is included with a package: amavisd-signer. It is a DKIM
  signing service daemon for amavisd. It uses an AM.PDP protocol lookalike
  to receive a request from amavisd and provides two services: choosing a
  signing key, and signing a message digest with a chosen DKIM private key.

  Amavisd uses this signing service when a $dkim_signing_service setting
  is defined and nonempty, and $enable_dkim_signing is true. For each
  mail message meeting the basic requirements for signing (originating,
  nonspam and not infected), the first request sent to a signing service
  passes some information about the message (its author, sender, recipients)
  and expects the service to choose and provide a suitable signing domain
  and selector (and optional signature options) when a signing key is
  available and the service considers it appropriate to sign the message.
  If the response does not provide a signing domain and selector,
  amavisd falls back to consulting its own settings (a dkim_key() set
  of signing keys, and @dkim_signature_options_bysender_maps).

  The second stage of signing occurs when a signing key has been uniquely
  identified during the first stage, i.e. when its signing domain and a
  selector have been determined. Amavisd computes a message digest according
  to DKIM specifications and passes it to the signing service, along with
  the signing domain and selector name. The signing service computes the
  signature and returns it as a 'b' attribute (corresponding to a 'b' tag
  of a DKIM signature), from which amavisd assembles the signature header
  field and inserts it into a message. The signing service may still choose
  not to sign at this stage, e.g. when a private key corresponding to the
  requested signing domain and selector is not available. If a signing
  service is not available or cannot sign, amavisd falls back to its own
  configured list of signing keys ( dkim_key() ) for backward compatibility.

  The main reason for separating the signing act from the main amavisd daemon
  is to make it possible to do the DKIM signing without letting amavisd
  have access to private keys - following the minimal 'need-to-know'
  security principles. For example, amavisd may be started as non-root or
  restarted from a jail, while the independent amavisd-signer process
  remains the only process with access to private signing keys (by running as
  root or under a separate UID or GID or with an access to a crypto device).

  Additional benefit is that more complex decisions on which signing key
  to use for which mail message can be delegated to the signing service,
  which can be customized (through code changes or replacing it altogether)
  without touching the main amavisd daemon.

  To let amavisd use a signing service, specify the signing service's
  IP address and TCP port number in amavisd.conf, e.g.:
    $dkim_signing_service = '127.0.0.1:20203';
  matching the $inet_socket_bind and @listen_sockets settings near the
  beginning of the 'amavisd-service' file, then start the signing service
  and restart amavisd daemon. Currently all the settings for amavisd-service
  are contained in its file, no external configuration file or command line
  options are available at present.

- a constant D_TEMPFAIL has been added to a set of allowed final_*_destiny
  values; mostly intended for completeness and testing;

- a new setting @listen_sockets offers a unified configuration of listening
  sockets. This list may be configured directly, or the traditional way: the
  $inet_socket_port and $unix_socketname just add their entries (if any)
  to the @listen_sockets list, and $inet_socket_bind provides a default
  binding IP address for inet or inet6 ports. Each socket specification
  may either be a unix socket path (as in $unix_socketname), or an inet or
  inet6 socket specification (a binding IP address as in $inet_socket_bind,
  combined with a port number $inet_socket_port, delimited by a colon,
  e.g. '127.0.0.1:10024', '[::1]:10024', '10024'.  When only a port number
  is specified without an IP address, the binding address defaults to
  $inet_socket_bind, which in turn (if left undefined), defaults to all
  interfaces.

  An 'unspecified' binding address '0.0.0.0' implies any socket of the inet
  family (IPv4), while an 'unspecified' address '::' implies any socket of
  an inet6 (IPv6) family. Depending on the operating system and its settings
  an inet6 socket may or may not be able to also accept inet connections.
  To be able to listen on inet6 (IPv6) sockets requires version 2.0 (or later)
  of the module Net::Server, or a patched Net::Server 0.99.

  Example:
    @listen_sockets = ( '10024', "$MYHOME/amavisd-proxy.sock",
      '0.0.0.0:10010', '127.0.0.1:10012', '10026', '9998', '[::1]:10028' );

- SMTP and LMTP client code now accepts a listref of peer socket
  specifications, or a single scalar specification as before. This allows
  for a failover in case some server is down or refuses connections.
  It also provides a simpleminded load balancing between next-hop
  (re-entry) MTA servers, as the selection from a list is random.
  Session caching still works, so if a recently used SMTP/LMTP session
  is still open, it will be reused, in which case no server randomization
  takes place for as long as the established session remains open.

  Typical configuration variables where