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# TRANSPORT(5) TRANSPORT(5)
#
# NAME
# transport - Postfix transport table format
#
# SYNOPSIS
# postmap /etc/postfix/transport
#
# postmap -q "string" /etc/postfix/transport
#
# postmap -q - /etc/postfix/transport <inputfile
#
# DESCRIPTION
# The optional transport(5) table specifies a mapping from
# email addresses to message delivery transports and next-
# hop destinations. Message delivery transports such as
# local or smtp are defined in the master.cf file, and next-
# hop destinations are typically hosts or domain names. The
# table is searched by the trivial-rewrite(8) daemon.
#
# This mapping overrides the default transport:nexthop
# selection that is built into Postfix:
#
# local_transport (default: local:$myhostname)
# This is the default for final delivery to domains
# listed with mydestination, and for [ipaddress] des-
# tinations that match $inet_interfaces or
# $proxy_interfaces. The default nexthop destination
# is the MTA hostname.
#
# virtual_transport (default: virtual:)
# This is the default for final delivery to domains
# listed with virtual_mailbox_domains. The default
# nexthop destination is the recipient domain.
#
# relay_transport (default: relay:)
# This is the default for remote delivery to domains
# listed with relay_domains. In order of decreasing
# precedence, the nexthop destination is taken from
# relay_transport, sender_dependent_relayhost_maps,
# relayhost, or from the recipient domain.
#
# default_transport (default: smtp:)
# This is the default for remote delivery to other
# destinations. In order of decreasing precedence,
# the nexthop destination is taken from sender_depen-
# dent_default_transport_maps, default_transport,
# sender_dependent_relayhost_maps, relayhost, or from
# the recipient domain.
#
# Normally, the transport(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/transport" to rebuild an indexed
# file after changing the corresponding transport table.
#
# 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 case, 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 the recipient address or
# domain, use 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.
#
# The pattern specifies an email address, a domain name, or
# a domain name hierarchy, as described in section "TABLE
# LOOKUP".
#
# The result is of the form transport:nexthop and specifies
# how or where to deliver mail. This is described in section
# "RESULT FORMAT".
#
# TABLE SEARCH ORDER
# With lookups from indexed files such as DB or DBM, or from
# networked tables such as NIS, LDAP or SQL, patterns are
# tried in the order as listed below:
#
# user+extension@domain transport:nexthop
# Deliver mail for user+extension@domain through
# transport to nexthop.
#
# user@domain transport:nexthop
# Deliver mail for user@domain through transport to
# nexthop.
#
# domain transport:nexthop
# Deliver mail for domain through transport to nex-
# thop.
#
# .domain transport:nexthop
# Deliver mail for any subdomain of domain through
# transport to nexthop. This applies only when the
# string transport_maps is not listed in the par-
# ent_domain_matches_subdomains configuration set-
# ting. Otherwise, a domain name matches itself and
# its subdomains.
#
# * transport:nexthop
# The special pattern * represents any address (i.e.
# it functions as the wild-card pattern, and is
# unique to Postfix transport tables).
#
# Note 1: the null recipient address is looked up as
# $empty_address_recipient@$myhostname (default: mailer-dae-
# mon@hostname).
#
# Note 2: user@domain or user+extension@domain lookup is
# available in Postfix 2.0 and later.
#
# RESULT FORMAT
# The lookup result is of the form transport:nexthop. The
# transport field specifies a mail delivery transport such
# as smtp or local. The nexthop field specifies where and
# how to deliver mail.
#
# The transport field specifies the name of a mail delivery
# transport (the first name of a mail delivery service entry
# in the Postfix master.cf file).
#
# The interpretation of the nexthop field is transport
# dependent. In the case of SMTP, specify a service on a
# non-default port as host:service, and disable MX (mail
# exchanger) DNS lookups with [host] or [host]:port. The []
# form is required when you specify an IP address instead of
# a hostname.
#
# A null transport and null nexthop result means "do not
# change": use the delivery transport and nexthop informa-
# tion that would be used when the entire transport table
# did not exist.
#
# A non-null transport field with a null nexthop field
# resets the nexthop information to the recipient domain.
#
# A null transport field with non-null nexthop field does
# not modify the transport information.
#
# EXAMPLES
# In order to deliver internal mail directly, while using a
# mail relay for all other mail, specify a null entry for
# internal destinations (do not change the delivery trans-
# port or the nexthop information) and specify a wildcard
# for all other destinations.
#
# my.domain :
# .my.domain :
# * smtp:outbound-relay.my.domain
#
# In order to send mail for example.com and its subdomains
# via the uucp transport to the UUCP host named example:
#
# example.com uucp:example
# .example.com uucp:example
#
# When no nexthop host name is specified, the destination
# domain name is used instead. For example, the following
# directs mail for user@example.com via the slow transport
# to a mail exchanger for example.com. The slow transport
# could be configured to run at most one delivery process at
# a time:
#
# example.com slow:
#
# When no transport is specified, Postfix uses the transport
# that matches the address domain class (see DESCRIPTION
# above). The following sends all mail for example.com and
# its subdomains to host gateway.example.com:
#
# example.com :[gateway.example.com]
# .example.com :[gateway.example.com]
#
# In the above example, the [] suppress MX lookups. This
# prevents mail routing loops when your machine is primary
# MX host for example.com.
#
# In the case of delivery via SMTP, one may specify host-
# name:service instead of just a host:
#
# example.com smtp:bar.example:2025
#
# This directs mail for user@example.com to host bar.example
# port 2025. Instead of a numerical port a symbolic name may
# be used. Specify [] around the hostname if MX lookups must
# be disabled.
#
# The error mailer can be used to bounce mail:
#
# .example.com error:mail for *.example.com is not deliverable
#
# This causes all mail for user@anything.example.com to be
# bounced.
#
# 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,
# some.domain.hierarchy is not looked up via its parent
# domains, nor is user+foo@domain looked up as user@domain.
#
# Patterns are applied in the order as specified in the ta-
# ble, until a pattern is found that matches the search
# string.
#
# The trivial-rewrite(8) server disallows regular expression
# substitution of $1 etc. in regular expression lookup
# tables, because that could open a security hole (Postfix
# version 2.3 and later).
#
# 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 recipient address
# once. Thus, some.domain.hierarchy is not looked up via
# its parent domains, nor is user+foo@domain looked up as
# user@domain.
#
# Results are the same as with indexed file lookups.
#
# 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.
#
# empty_address_recipient
# The address that is looked up instead of the null
# sender address.
#
# parent_domain_matches_subdomains
# List of Postfix features that use domain.tld pat-
# terns to match sub.domain.tld (as opposed to
# requiring .domain.tld patterns).
#
# transport_maps
# List of transport lookup tables.
#
# SEE ALSO
# trivial-rewrite(8), rewrite and resolve addresses
# master(5), master.cf file format
# postconf(5), configuration parameters
# postmap(1), Postfix lookup table manager
#
# 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
# FILTER_README, external content filter
#
# 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
#
# TRANSPORT(5)