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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 network interface addresses that this mail sys-
+# tem receives mail on.
+#
+# 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.
+#
+# 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)