#++
# NAME
#	transport 5
# SUMMARY
#	format of Postfix transport table
# SYNOPSIS
#	\fBpostmap /etc/postfix/transport\fR
#
#	\fBpostmap -q "\fIstring\fB" /etc/postfix/transport\fR
#
#	\fBpostmap -q - /etc/postfix/transport <\fIinputfile\fR
# DESCRIPTION
#	The optional \fBtransport\fR table specifies a mapping from email
#	addresses to message delivery transports and/or relay hosts. The
#	mapping is used by the \fBtrivial-rewrite\fR(8) daemon.
#
#	Normally, the \fBtransport\fR table is specified as a text file
#	that serves as input to the \fBpostmap\fR(1) command.
#	The result, an indexed file in \fBdbm\fR or \fBdb\fR format, is used
#	for fast searching by the mail system. Execute the command
#	\fBpostmap /etc/postfix/transport\fR in order to rebuild the indexed
#	file after changing the 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 expressions. In that case,
#	the lookups are done in a slightly different way as described
#	in section "REGULAR EXPRESSION TABLES".
# TABLE FORMAT
# .ad
# .fi
#	The format of the transport table is as follows:
# .IP "\fIpattern result\fR"
#	When \fIpattern\fR matches the recipient address or domain, use the
#	corresponding \fIresult\fR.
# .IP "blank lines and comments"
#	Empty lines and whitespace-only lines are ignored, as
#	are lines whose first non-whitespace character is a `#'.
# .IP "multi-line text"
#	A logical line starts with non-whitespace text. A line that
#	starts with whitespace continues a logical line.
# .PP
#	The \fIpattern\fR specifies an email address, a domain name, or
#	a domain name hierarchy, as described in section "TABLE LOOKUP".
#
#	The \fIresult\fR is of the form \fItransport\fB:\fInexthop\fR.
#	The \fItransport\fR field specifies a mail delivery transport
#	such as \fBsmtp\fR or \fBlocal\fR. The \fInexthop\fR field
#	specifies where and how to deliver mail. More details are given
#	in section "RESULT FORMAT".
# TABLE LOOKUP
# .ad
# .fi
#	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:
# .IP "\fIuser+extension@domain transport\fR:\fInexthop\fR"
#	Mail for \fIuser+extension@domain\fR is delivered through
#	\fItransport\fR to
#	\fInexthop\fR.
# .IP "\fIuser@domain transport\fR:\fInexthop\fR"
#	Mail for \fIuser@domain\fR is delivered through \fItransport\fR to
#	\fInexthop\fR.
# .IP "\fIdomain transport\fR:\fInexthop\fR"
#	Mail for \fIdomain\fR is delivered through \fItransport\fR to
#	\fInexthop\fR.
# .IP "\fI.domain transport\fR:\fInexthop\fR"
#	Mail for any subdomain of \fIdomain\fR is delivered through
#	\fItransport\fR to \fInexthop\fR. This applies only when the
#	string \fBtransport_maps\fR is not listed in the
#	\fBparent_domain_matches_subdomains\fR configuration setting.
#	Otherwise, a domain name matches itself and its subdomains.
# .PP
#	Note 1: the special pattern \fB*\fR represents any address (i.e. it
#	functions as the wild-card pattern).
#
#	Note 2: the null recipient address is looked up as
#	\fB$empty_address_recipient\fR@\fB$myhostname\fR (default:
#	mailer-daemon@hostname).
# RESULT FORMAT
# .ad
# .fi
#	The transport field specifies the name of a mail delivery transport
#	(the first name of a mail delivery service entry in the Postfix
#	\fBmaster.cf\fR file).
#
#	The interpretation of the nexthop field is transport
#	dependent. In the case of SMTP, specify \fIhost\fR:\fIservice\fR for a
#	non-default server port, and use [\fIhost\fR] or [\fIhost\fR]:\fIport\fR
#	in order to disable MX (mail exchanger) DNS lookups. The [] form
#	is required when you specify an IP address instead of a hostname.
#
#	A null \fItransport\fR and null \fInexthop\fR result means "do
#	not change": use the delivery transport and nexthop information
#	that would be used when the entire transport table did not exist.
#
#	A non-null \fItransport\fR field with a null \fInexthop\fR field
#	resets the nexthop information to the recipient domain.
#
#	A null \fItransport\fR field with non-null \fInexthop\fR field
#	does not modify the transport information.
# EXAMPLES
# .ad
# .fi
#	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 transport or
#	the nexthop information) and specify a wildcard for all other
#	destinations.
#
# .ti +5
#	\fB\&my.domain    :\fR
# .ti +5
#	\fB\&.my.domain   :\fR
# .ti +5
#	\fB*            smtp:outbound-relay.my.domain\fR
#
#	In order to send mail for \fBfoo.org\fR and its subdomains
#	via the \fBuucp\fR transport to the UUCP host named \fBfoo\fR:
#
# .ti +5
#	\fBfoo.org      uucp:foo\fR
# .ti +5
#	\fB\&.foo.org     uucp:foo\fR
#
#	When no nexthop host name is specified, the destination domain
#	name is used instead. For example, the following directs mail for
#	\fIuser\fR@\fBfoo.org\fR via the \fBslow\fR transport to a mail
#	exchanger for \fBfoo.org\fR.  The \fBslow\fR transport could be
#	something that runs at most one delivery process at a time:
#
# .ti +5
#	\fBfoo.org      slow:\fR
#
#	When no transport is specified, Postfix uses the transport that
#	matches the address domain class (see TRANSPORT FIELD discussion
#	above).  The following sends all mail for \fBfoo.org\fR and its
#	subdomains to host \fBgateway.foo.org\fR:
#
# .ti +5
#	\fBfoo.org      :[gateway.foo.org]\fR
# .ti +5
#	\fB\&.foo.org     :[gateway.foo.org]\fR
#
#	In the above example, the [] are used to suppress MX lookups.
#	The result would likely point to your local machine.
#
#	In the case of delivery via SMTP, one may specify
#	\fIhostname\fR:\fIservice\fR instead of just a host:
#
# .ti +5
#	\fBfoo.org      smtp:bar.org:2025\fR
#
#	This directs mail for \fIuser\fR@\fBfoo.org\fR to host \fBbar.org\fR
#	port \fB2025\fR. Instead of a numerical port a symbolic name may be
#	used. Specify [] around the hostname in order to disable MX lookups.
#
#	The error mailer can be used to bounce mail:
#
# .ti +5
#	\fB\&.foo.org      error:mail for *.foo.org is not deliverable\fR
#
#	This causes all mail for \fIuser\fR@\fIanything\fB.foo.org\fR
#	to be bounced.
# REGULAR EXPRESSION TABLES
# .ad
# .fi
#	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 \fBregexp_table\fR(5)
#	or \fBpcre_table\fR(5).
#
#	Each pattern is a regular expression that is applied to the entire
#	domain being looked up. Thus, \fIsome.domain.hierarchy\fR is not
#	broken up into parent domains.
#
#	Patterns are applied in the order as specified in the table, 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 \fB$1\fR, \fB$2\fR and so on.
# CONFIGURATION PARAMETERS
# .ad
# .fi
#	The following \fBmain.cf\fR parameters are especially relevant to
#	this topic. See the Postfix \fBmain.cf\fR file for syntax details
#	and for default values. Use the \fBpostfix reload\fR command after
#	a configuration change.
# .IP \fBempty_address_recipient\fR
#	The address that is looked up instead of the null sender address.
# .IP \fBparent_domain_matches_subdomains\fR
#	List of Postfix features that use \fIdomain.tld\fR patterns
#	to match \fIsub.domain.tld\fR (as opposed to
#	requiring \fI.domain.tld\fR patterns).
# .IP \fBtransport_maps\fR
#	List of transport lookup tables.
# SEE ALSO
#	postmap(1) create mapping table
#	trivial-rewrite(8) rewrite and resolve addresses
#	pcre_table(5) format of PCRE tables
#	regexp_table(5) format of POSIX regular expression tables
# LICENSE
# .ad
# .fi
#	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
#--

# By default, this file is not used.  See sample-transport.cf
