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# GENERIC(5) GENERIC(5)
#
# NAME
# generic - Postfix generic table format
#
# SYNOPSIS
# postmap /etc/postfix/generic
#
# postmap -q "string" /etc/postfix/generic
#
# postmap -q - /etc/postfix/generic <inputfile
#
# DESCRIPTION
# The optional generic(5) table specifies an address mapping
# that applies when mail is delivered. This is the opposite
# of canonical(5) mapping, which applies when mail is
# received.
#
# Typically, one would use the generic(5) table on a system
# that does not have a valid Internet domain name and that
# uses something like localdomain.local instead. The
# generic(5) table is then used by the smtp(8) client to
# transform local mail addresses into valid Internet mail
# addresses when mail has to be sent across the Internet.
# See the EXAMPLE section at the end of this document.
#
# The generic(5) mapping affects both message header
# addresses (i.e. addresses that appear inside messages) and
# message envelope addresses (for example, the addresses
# that are used in SMTP protocol commands).
#
# Normally, the generic(5) table is specified as a text file
# that serves as input to the postmap(1) command. The
# result, an indexed file in dbm or db format, is used for
# fast searching by the mail system. Execute the command
# "postmap /etc/postfix/generic" to rebuild an indexed file
# after changing the corresponding text file.
#
# When the table is provided via other means such as NIS,
# LDAP or SQL, the same lookups are done as for ordinary
# indexed files.
#
# Alternatively, the table can be provided as a regu-
# lar-expression map where patterns are given as regular
# expressions, or lookups can be directed to a TCP-based
# server. In those cases, the lookups are done in a slightly
# different way as described below under "REGULAR EXPRESSION
# TABLES" or "TCP-BASED TABLES".
#
# CASE FOLDING
# The search string is folded to lowercase before database
# lookup. As of Postfix 2.3, the search string is not case
# folded with database types such as regexp: or pcre: whose
# lookup fields can match both upper and lower case.
#
# TABLE FORMAT
# The input format for the postmap(1) command is as follows:
#
# pattern result
# When pattern matches a mail address, replace it by
# the corresponding result.
#
# blank lines and comments
# Empty lines and whitespace-only lines are ignored,
# as are lines whose first non-whitespace character
# is a `#'.
#
# multi-line text
# A logical line starts with non-whitespace text. A
# line that starts with whitespace continues a logi-
# cal line.
#
# TABLE SEARCH ORDER
# With lookups from indexed files such as DB or DBM, or from
# networked tables such as NIS, LDAP or SQL, each
# user@domain query produces a sequence of query patterns as
# described below.
#
# Each query pattern is sent to each specified lookup table
# before trying the next query pattern, until a match is
# found.
#
# user@domain address
# Replace user@domain by address. This form has the
# highest precedence.
#
# user address
# Replace user@site by address when site is equal to
# $myorigin, when site is listed in $mydestination,
# or when it is listed in $inet_interfaces or
# $proxy_interfaces.
#
# @domain address
# Replace other addresses in domain by address. This
# form has the lowest precedence.
#
# RESULT ADDRESS REWRITING
# The lookup result is subject to address rewriting:
#
# o When the result has the form @otherdomain, the
# result becomes the same user in otherdomain.
#
# o When "append_at_myorigin=yes", append "@$myorigin"
# to addresses without "@domain".
#
# o When "append_dot_mydomain=yes", append ".$mydomain"
# to addresses without ".domain".
#
# ADDRESS EXTENSION
# When a mail address localpart contains the optional recip-
# ient delimiter (e.g., user+foo@domain), the lookup order
# becomes: user+foo@domain, user@domain, user+foo, user, and
# @domain.
#
# The propagate_unmatched_extensions parameter controls
# whether an unmatched address extension (+foo) is propa-
# gated to the result of table lookup.
#
# REGULAR EXPRESSION TABLES
# This section describes how the table lookups change when
# the table is given in the form of regular expressions. For
# a description of regular expression lookup table syntax,
# see regexp_table(5) or pcre_table(5).
#
# Each pattern is a regular expression that is applied to
# the entire address being looked up. Thus, user@domain mail
# addresses are not broken up into their user and @domain
# constituent parts, nor is user+foo broken up into user and
# foo.
#
# Patterns are applied in the order as specified in the ta-
# ble, until a pattern is found that matches the search
# string.
#
# Results are the same as with indexed file lookups, with
# the additional feature that parenthesized substrings from
# the pattern can be interpolated as $1, $2 and so on.
#
# TCP-BASED TABLES
# This section describes how the table lookups change when
# lookups are directed to a TCP-based server. For a descrip-
# tion of the TCP client/server lookup protocol, see tcp_ta-
# ble(5). This feature is available in Postfix 2.5 and
# later.
#
# Each lookup operation uses the entire address once. Thus,
# user@domain mail addresses are not broken up into their
# user and @domain constituent parts, nor is user+foo broken
# up into user and foo.
#
# Results are the same as with indexed file lookups.
#
# EXAMPLE
# The following shows a generic mapping with an indexed
# file. When mail is sent to a remote host via SMTP, this
# replaces his@localdomain.local by his ISP mail address,
# replaces her@localdomain.local by her ISP mail address,
# and replaces other local addresses by his ISP account,
# with an address extension of +local (this example assumes
# that the ISP supports "+" style address extensions).
#
# /etc/postfix/main.cf:
# smtp_generic_maps = hash:/etc/postfix/generic
#
# /etc/postfix/generic:
# his@localdomain.local hisaccount@hisisp.example
# her@localdomain.local heraccount@herisp.example
# @localdomain.local hisaccount+local@hisisp.example
#
# Execute the command "postmap /etc/postfix/generic" when-
# ever the table is changed. Instead of hash, some systems
# use dbm database files. To find out what tables your sys-
# tem supports use the command "postconf -m".
#
# BUGS
# The table format does not understand quoting conventions.
#
# CONFIGURATION PARAMETERS
# The following main.cf parameters are especially relevant.
# The text below provides only a parameter summary. See
# postconf(5) for more details including examples.
#
# smtp_generic_maps (empty)
# Optional lookup tables that perform address rewrit-
# ing in the Postfix SMTP client, typically to trans-
# form a locally valid address into a globally valid
# address when sending mail across the Internet.
#
# propagate_unmatched_extensions (canonical, virtual)
# What address lookup tables copy an address exten-
# sion from the lookup key to the lookup result.
#
# Other parameters of interest:
#
# inet_interfaces (all)
# The local network interface addresses that this
# mail system receives mail on.
#
# proxy_interfaces (empty)
# The remote network interface addresses that this
# mail system receives mail on by way of a proxy or
# network address translation unit.
#
# mydestination ($myhostname, localhost.$mydomain, local-
# host)
# The list of domains that are delivered via the
# $local_transport mail delivery transport.
#
# myorigin ($myhostname)
# The domain name that locally-posted mail appears to
# come from, and that locally posted mail is deliv-
# ered to.
#
# owner_request_special (yes)
# Enable special treatment for owner-listname entries
# in the aliases(5) file, and don't split owner-list-
# name and listname-request address localparts when
# the recipient_delimiter is set to "-".
#
# SEE ALSO
# postmap(1), Postfix lookup table manager
# postconf(5), configuration parameters
# smtp(8), Postfix SMTP client
#
# README FILES
# Use "postconf readme_directory" or "postconf html_direc-
# tory" to locate this information.
# ADDRESS_REWRITING_README, address rewriting guide
# DATABASE_README, Postfix lookup table overview
# STANDARD_CONFIGURATION_README, configuration examples
#
# LICENSE
# The Secure Mailer license must be distributed with this
# software.
#
# HISTORY
# A genericstable feature appears in the Sendmail MTA.
#
# This feature is available in Postfix 2.2 and later.
#
# AUTHOR(S)
# Wietse Venema
# IBM T.J. Watson Research
# P.O. Box 704
# Yorktown Heights, NY 10598, USA
#
# Wietse Venema
# Google, Inc.
# 111 8th Avenue
# New York, NY 10011, USA
#
# GENERIC(5)
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