* 2016-09-22: version 1.37
   - added initial test suite
   - testing using travis-ci (https://travis-ci.org/schweikert/postgrey)
   - removed IP pool-detection code for --lookup-by-net, because it matched
     also the naming of some big hosters like facebook (#32, Michal Petrucha,
     Andrew Ayer, Jon Sailor)
   - fix early logging of errors and warnings to syslog
   - simplified IP matching code
   - added support for IPv6 whitelists with netmask
   - add network-range based whitelist for Office 365 (Holger Stember)
   - updated whitelist
 
* 2015-09-01: version 1.36
   - improved support for IPv6 addresses: new --ipv4cidr and --ipv6cidr options
     for proper subnetting of IPv6 (Håvard Moen, BenediktS)
   - updated whitelist
   - user-settable unix socket permission: --socketmode (Teubel György)
   - init script fixes (Sacha Ott)

* 2014-06-11: version 1.35
   - use just 'postgrey' as process name, instead of '/usr/sbin/postgrey', because
     Linux tools are limited to 15 characters (#5)
   - Make postgrey work with Perl 5.18 (Yasuhiro KIMURA, #4)
   - updated whitelist

* 2011-05-04: version 1.34

   - gracefully handle future timestamps in the database (Andreas Hoedle)
   - replaced obsolete Digest::SHA1 with Digest::SHA (Salvatore Bonaccorso)
   - updated whitelist

* 2010-05-04: version 1.33

   - fix warning with IPv6 address (Edwin Kremer)
   - added --x-greylist-header option (Guido Leisker)
   - contrib/postgrey.init: new LSB-compliant init script by Adrian von Bidder
     (Debian)
   - contrib/postgreyreport: fix POD error (Christian Perrier)
   - contrib/postgreyreport: added --tab and --show_time options (Leonard den
     Ottolander)
   - updated whitelist

* 2008-07-22: version 1.32

   - fixed recipients whitelisting (David Carrel)
   - added --syslog-facility option (Peter Rabbitson)
   - add support for BATV (Edwin Groothuis)
   - updated whitelist

* 2007-09-06: version 1.31

   - support CIDR-style addresses in the client whitelist (Claudio Strizzolo)
   - improve logging of unresolveable hosts (Adrian von Bidder, Heiko
     Schlichting)
   - updated whitelist
   - fix unix socket permission issues (Martin F Krafft, Adrian von Bidder,
     Leos Bitto, Debian bug #376910)
   - fix regexps for matching hosts in whitelists (Antonello Nocchi)
   - do maintenance after the current request and not before (Clifton Royston)

* 2007-08-02: version 1.30

   - implemented --listen-queue-size option (you usually don't need to set it
     except for big sites).
   - small fix to the 'native' syslogging implemented in 1.29

* 2007-07-23: version 1.29

   - workaround for a possible crash with Sys::Syslog < 0.15 when syslog
     messages were generated during syslog file rotation
   - use the 'native' logging socket with Sys::Syslog >= 0.15 (Philipp Koller)
 
* 2007-06-21: version 1.28

   - improved logging (postgrey is now more verbose, use the new --quiet
     option if that bothers you)
   - improved Exim support (see Debian bug #380257)
   - workaround for a bug in Exchange dealing with temporary failures
     (use DSN code 4.2.0 instead of the default 4.7.1)
   - added 'policy-test' script for testing postgrey's performance or pre-seeding
     the database
   - fix logging of delayed, unresolveable clients in syslog (Andreas Metzler)
   - more descriptive error message on DB failure (Adrian von Bidder)
   - updated whitelist
   - new homepage: http://postgrey.schweikert.ch/

* 2006-07-17: version 1.27

   - fix socket permissions with Net::Server >= 0.94 (Leos Bitto)

* 2006-07-12: version 1.26

   - added support for Exim (Guy Antony Halse)
   - greatly improve cleanup speed with explicit transactions (Maeda Atusi)

* 2006-06-29: version 1.25

   - updated whitelist
   - bugfix: --privacy was not working
   - change default greylist-text not to include the number of
     seconds left, since it seems that spammers are misusing it.
   - added --hostname option (Maarten de Vries)

* 2006-01-16: version 1.24

   - updated whitelist with many new entries (Vito Robar)
   - added --privacy option (Micah Anderson)
   - don't use DB_TXN_NOSYNC to workaround an apparent bug in Berkeley-DB
     (Nick Moffitt)
   - fix use of unitialized value (Bjoern A. Zeeb)
   - Use 'permit_mynetworks' in the documentation (Keith Lofstrom)

* 2005-11-23: version 1.23

   - fix compatibility with Berkeley-DB < 4.1
   - fix crash in the database-cleanup routine (Vito Robar)
   - updated whitelist
   - don't be pedantic about wrong reverse-dns entries: it doesn't really help
     and it could affect legitimate mail servers (Andreas Hoedle)

* 2005-11-11: version 1.22

   - compatibility for log() of Net::Server 0.88
   - don't enter triplets for auto-whitelisted clients (reduce size of main db)
   - updated whitelist
   - replace log() with mylog() so that we don't need to worry about
     format-string problems again
   - add support for IPv6 in whitelists (Adrian Knoth)
   - the --dbdir option was not working because of taint-mode (Sven Mueller)
   - allow comments on the same line (Nigel Gorry)

* 2005-04-14: version 1.21

   Security: this release fixes a remotely exploitable DoS vulnerability
   (CVE-2005-1127)

   - fix crash with '%' in sender addresses (Stefan Schmidt)
   - fix other users of unchecked strings with syslog/printf (Peter Bieringer)
   - run in tainted mode -T (Peter Bieringer)
     (version 1.19 and 1.20 were released on the same day with the above fixes)

* 2005-03-07: version 1.18

   - correctly set the locale to C so that no internationalized 8bit-text
     is put in the headers (Bernhard Weisshuhn)
   - syslog delays (when a X-Greylist header is added)
   - bugfix: sometimes the retry-window was not properly enforced
   - bugfix: argument parsing in postgreyreport (MJH)
   - include the recipient-domain in the default --greylist-text so
     that the concerned mail-server can be determined and a contact-address
     can be given on the help page
   - better documentation for --greylist-text
   - just warn if DB_AUTO_COMMIT is not available because an older berkeley-db
     is used (Adrian 'Dagurashibanipal' von Bidder)

* 2004-12-14: version 1.17

   - added --auto-whitelist-clients option (Andreas Hoedle)
     it is turned on by default, to disable it specify
     --auto-whitelist-clients=0
   - removed "transition code" of version 1.14
   - command-line as process name instead of just 'perl' (Pierre Thierry)
   - add option --group or set group to 'nogroup' (Adrian 'Dagurashibanipal'
     von Bidder)

* 2004-09-08: version 1.16
   
   - increase max-time to 35, so that monthly newsletter are not
     greylisted (Stephen Gildea)
   - set LC_ALL=C so that no localized text is output at the SMTP level
     (Michal Trojnara)
   - add a "help" URL to the Greylisted for ... message (Steve Traugott)
   - updated whitelist

* 2004-08-18: version 1.15

  - fixed --retry-window with hours (Tom Baker)
  - update postgreyreport to version 1.14.2 (Tom Baker)
  - update whitelist

* 2004-07-12: version 1.14

  - lookup-by-subnet is default. "transition code" has been implemented, so that
    also a lookup with the unstripped IP will be tried. That way you shouldn't
    loose any data from the database when moving to version 1.14. Use
    --lookup-by-host for the old behaviour. All "address pool" entries are
    removed from the whitelist...
  - loosen "IP in reverse name" test (Matt Egan)
  - changed default --max-age to 30, since the db should shrink a lot
    because of the --retry-window functionality (you might want to
    db_dump/db_load your db to make it really shrink on disk)
  - another Perl 5.8.0 workaround
  - implemented --greylist-text (Tom Baker)
  - replaced X-Postgrey header with a X-Greylist header which is more similar
    to what greylist-milter does (Stephen Gildea)
  - implemented --greylist-action (Stephen Gildea)
  - updated postgreyreport (Tom Baker)
  - update whitelist

* 2004-07-05: version 1.13

  - strip sender address extension (everything after '+'), so that more
    VERP addresses are substituted to a unique string.
    (Stephane Bortzmeyer, Santiago Vila)
  - update whitelist
  - allow more than one --whitelist-xy option (Xavier Le Vourch)
  - implemented --retry-window (Tom Baker)
  - reload whitelists on HUP
  - add postmaster and abuse to recipients whitelist
  - add X-Postgrey header to delayed mails

* 2004-07-02: version 1.12

  - support IPs in the postgrey_whitelist_clients file (Tom Baker)
  - new version of postgreyreport (Tom Baker)
  - update whitelist
  - workaround Perl 5.8.0 bug (Matt Egan)

* 2004-06-29: version 1.11

  - support for regular expressions in whitelists
  - update whitelist (Duncan Hill)

* 2004-06-26: version 1.10

  - fix syntax error in code for --lookup-by-subnet (Matt Egan)

* 2004-06-25: version 1.9

  - case-insensitive whitelists
  - fix permissions of --unix socket (Arnaud Launay)

* 2004-06-24: version 1.8

  - postfix-style syntax for whitelists
  - add .0 on --lookup-by-subnet (Tom Baker)

* 2004-06-24: version 1.7

  - bugfix: wrong syslog call ('warn' instead of 'warning')
  - update whitelist
  - allow input with cr-lf lines for testing (Tom Baker)
  - implemented --lookup-by-subnet (Tom Baker)
  - use 'unix' syslog socket on non-solaris platforms (Matt Egan)
  - implemented whitelist support from postgrey itself (instead of using
    postfix restrictions: easier to setup)
  - included contrib/postgrey-report by Tom Baker

* 2004-06-11: version 1.6

  - rewritten verp substitution code
  - when doing keys maintenance: report about how many keys there where before
    and after.
  - update whitelist

* 2004-06-03: version 1.5

  - default delay is now 300 seconds instead of 600 (received reports of
    mailers that try again the first time after 8 minutes and it doesn't seem
    to matter right now for filtering spam: they never come again)
  - report in the log the real time that is left, after which the triplet will
    be accepted
  - traverse the database for cleaning old entries only during the night
    and only once per day
  - more efficient traversal of database for cleaning (Matthew Reimer)
  - fix syslogging of warnings and fatal errors

* 2004-05-24: version 1.4

  - log removal was not working (need to call txn_checkpoint first)

* 2004-05-22: version 1.3

  - PID file generation with --pidfile (Ralf Engelschall)
  - fix opening of unix socket (Ralf Engelschall)

* 2004-05-21: version 1.2

  - create files readable only by the user (umask 077)
  - logging bugfixes
  - compatibility with older Berkeley DBs (3.x should work)

* 2004-05-21: version 1.1

  - use log_archive method every hour instead of DB_LOG_AUTOREMOVE
  - cosmetic fixes (Ralf Hildebrandt)

* 2004-05-20: version 1.0

  - initial public release

Note: The names in braces do usually give credit where the idea comes from
      and not who did implement it (which is mostly me)