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# CANONICAL(5) CANONICAL(5)
#
# NAME
# canonical - Postfix canonical table format
#
# SYNOPSIS
# postmap /etc/postfix/canonical
#
# postmap -q "string" /etc/postfix/canonical
#
# postmap -q - /etc/postfix/canonical <inputfile
#
# DESCRIPTION
# The optional canonical(5) table specifies an address map-
# ping for local and non-local addresses. The mapping is
# used by the cleanup(8) daemon, before mail is stored into
# the queue. The address mapping is recursive.
#
# Normally, the canonical(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/canonical" 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 regular-
# expression map where patterns are given as regular expres-
# sions, or lookups can be directed to 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".
#
# By default the canonical(5) mapping affects both message
# header addresses (i.e. addresses that appear inside mes-
# sages) and message envelope addresses (for example, the
# addresses that are used in SMTP protocol commands). This
# is controlled with the canonical_classes parameter.
#
# NOTE: Postfix versions 2.2 and later rewrite message head-
# ers from remote SMTP clients only if the client matches
# the local_header_rewrite_clients parameter, or if the
# remote_header_rewrite_domain configuration parameter spec-
# ifies a non-empty value. To get the behavior before Post-
# fix 2.2, specify "local_header_rewrite_clients =
# static:all".
#
# Typically, one would use the canonical(5) table to replace
# login names by Firstname.Lastname, or to clean up
# addresses produced by legacy mail systems.
#
# The canonical(5) mapping is not to be confused with vir-
# tual alias support or with local aliasing. To change the
# destination but not the headers, use the virtual(5) or
# aliases(5) map instead.
#
# 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.
#
# This is useful to clean up addresses produced by
# legacy mail systems. It can also be used to pro-
# duce Firstname.Lastname style addresses, but see
# below for a simpler solution.
#
# 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
# $proxy_interfaces.
#
# This form is useful for replacing login names by
# Firstname.Lastname.
#
# @domain address
# Replace other addresses in domain by address. This
# form has the lowest precedence.
#
# Note: @domain is a wild-card. When this form is
# applied to recipient addresses, the Postfix SMTP
# server accepts mail for any recipient in domain,
# regardless of whether that recipient exists. This
# may turn your mail system into a backscatter
# source: Postfix first accepts mail for non-existent
# recipients and then tries to return that mail as
# "undeliverable" to the often forged sender address.
#
# RESULT ADDRESS REWRITING
# The lookup result is subject to address rewriting:
#
# o When the result has the form @otherdomain, the
# result becomes the same user in otherdomain.
#
# o When "append_at_myorigin=yes", append "@$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 not available up to and including
# Postfix version 2.4.
#
# 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.
#
# 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.
#
# canonical_classes
# What addresses are subject to canonical address
# mapping.
#
# canonical_maps
# List of canonical mapping tables.
#
# recipient_canonical_maps
# Address mapping lookup table for envelope and
# header recipient addresses.
#
# sender_canonical_maps
# Address mapping lookup table for envelope and
# header sender addresses.
#
# propagate_unmatched_extensions
# A list of address rewriting or forwarding mecha-
# nisms that propagate an address extension from the
# original address to the result. Specify zero or
# more of canonical, virtual, alias, forward,
# include, or generic.
#
# Other parameters of interest:
#
# inet_interfaces
# The network interface addresses that this system
# receives mail on. You need to stop and start Post-
# fix when this parameter changes.
#
# local_header_rewrite_clients
# Rewrite message header addresses in mail from these
# clients and update incomplete addresses with the
# domain name in $myorigin or $mydomain; either don't
# rewrite message headers from other clients at all,
# or rewrite message headers and update incomplete
# addresses with the domain specified in the
# remote_header_rewrite_domain parameter.
#
# proxy_interfaces
# Other interfaces that this machine receives mail on
# by way of a proxy agent or network address transla-
# tor.
#
# masquerade_classes
# List of address classes subject to masquerading:
# zero or more of envelope_sender, envelope_recipi-
# ent, header_sender, header_recipient.
#
# masquerade_domains
# List of domains that hide their subdomain struc-
# ture.
#
# masquerade_exceptions
# List of user names that are not subject to address
# masquerading.
#
# mydestination
# List of domains that this mail system considers
# local.
#
# myorigin
# The domain that is appended to locally-posted mail.
#
# owner_request_special
# Give special treatment to owner-xxx and xxx-request
# addresses.
#
# remote_header_rewrite_domain
# Don't rewrite message headers from remote clients
# at all when this parameter is empty; otherwise, re-
# write message headers and append the specified
# domain name to incomplete addresses.
#
# SEE ALSO
# cleanup(8), canonicalize and enqueue mail
# postmap(1), Postfix lookup table manager
# postconf(5), configuration parameters
# virtual(5), virtual aliasing
#
# README FILES
# Use "postconf readme_directory" or "postconf html_direc-
# tory" to locate this information.
# DATABASE_README, Postfix lookup table overview
# ADDRESS_REWRITING_README, address rewriting guide
#
# LICENSE
# The Secure Mailer license must be distributed with this
# software.
#
# AUTHOR(S)
# Wietse Venema
# IBM T.J. Watson Research
# P.O. Box 704
# Yorktown Heights, NY 10598, USA
#
# CANONICAL(5)