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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 regu-
+# lar-expression map where patterns are given as regular
+# expressions, 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 address
+# When pattern matches a mail address, replace it by
+# the corresponding address.
+#
+# 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
+# $proxy_interfaces.
+#
+# This form is useful for replacing login names by
+# Firstname.Lastname.
+#
+# @domain address
+# Replace other addresses in domain by address. This
+# form has the lowest precedence.
+#
+# Note: @domain is a wild-card. When this form is
+# applied to recipient addresses, the Postfix SMTP
+# server accepts mail for any recipient in domain,
+# regardless of whether that recipient exists. This
+# may turn your mail system into a backscatter
+# source: Postfix first accepts mail for non-existent
+# recipients and then tries to return that mail as
+# "undeliverable" to the often forged sender address.
+#
+# To avoid backscatter with mail for a wild-card
+# domain, replace the wild-card mapping with explicit
+# 1:1 mappings, or add a reject_unverified_recipient
+# restriction for that domain:
+#
+# smtpd_recipient_restrictions =
+# ...
+# reject_unauth_destination
+# check_recipient_access
+# inline:{example.com=reject_unverified_recipient}
+# unverified_recipient_reject_code = 550
+#
+# In the above example, Postfix may contact a remote
+# server if the recipient is rewritten to a remote
+# address.
+#
+# RESULT ADDRESS REWRITING
+# The lookup result is subject to address rewriting:
+#
+# o When the result has the form @otherdomain, the
+# result becomes the same user in otherdomain.
+#
+# o When "append_at_myorigin=yes", append "@$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 (envelope_sender, envelope_recipient,
+# header_sender, header_recipient)
+# What addresses are subject to canonical_maps
+# address mapping.
+#
+# canonical_maps (empty)
+# Optional address mapping lookup tables for message
+# headers and envelopes.
+#
+# recipient_canonical_maps (empty)
+# Optional address mapping lookup tables for envelope
+# and header recipient addresses.
+#
+# sender_canonical_maps (empty)
+# Optional address mapping lookup tables for envelope
+# and header sender addresses.
+#
+# 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 network interface addresses that this mail sys-
+# tem receives mail on.
+#
+# local_header_rewrite_clients (permit_inet_interfaces)
+# 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 (empty)
+# The network interface addresses that this mail sys-
+# tem receives mail on by way of a proxy or network
+# address translation unit.
+#
+# masquerade_classes (envelope_sender, header_sender,
+# header_recipient)
+# What addresses are subject to address masquerading.
+#
+# masquerade_domains (empty)
+# Optional list of domains whose subdomain structure
+# will be stripped off in email addresses.
+#
+# masquerade_exceptions (empty)
+# Optional list of user names that are not subjected
+# to address masquerading, even when their address
+# matches $masquerade_domains.
+#
+# mydestination ($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 "-".
+#
+# remote_header_rewrite_domain (empty)
+# 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
+#
+# Wietse Venema
+# Google, Inc.
+# 111 8th Avenue
+# New York, NY 10011, USA
+#
+# CANONICAL(5)