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RedHat 9 (Linux i386) - man page for transport (redhat section 5)

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TRANSPORT(5)									     TRANSPORT(5)

       transport - format of Postfix transport table

       postmap /etc/postfix/transport

       The optional transport table specifies a mapping from domain hierarchies to message deliv-
       ery transports and/or relay hosts. The mapping is used by the trivial-rewrite(8) daemon.

       Normally, the transport 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 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 below.

       The format of the transport table is as follows:

       pattern result
	      When pattern matches the 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 logical line.

       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:

       domain transport:nexthop
	      Mail for domain is delivered through transport to nexthop.

       .domain transport:nexthop
	      Mail  for  any  subdomain of domain is delivered through transport to nexthop. This
	      applies  only  when  the	string	transport_maps	is  not  listed   in   the   par-
	      ent_domain_matches_subdomains  configuration  setting.   Otherwise,  a  domain name
	      matches itself and its subdomains.

       Note: transport map entries take precedence over domains specified  in  the  mydestination
       parameter.  If  you  use  the  optional transport map, it may be safer to specify explicit
       entries for all domains specified in mydestination, for example:

	    hostname.my.domain	 local:
	    localhost.my.domain      local:

       The interpretation of the nexthop field is transport dependent. In the case of SMTP, spec-
       ify  host:service for a non-default server port, and use [host] or [host]:port in order to
       disable MX (mail exchanger) DNS lookups. The [] form can also be used  with  IP	addresses
       instead of hostnames.

       In  order  to  send mail for foo.org and its subdomains via the uucp transport to the UUCP
       host named foo:

	    foo.org	 uucp:foo
	    .foo.org	 uucp:foo

       When no nexthop host name is specified, the destination domain name is used  instead.  For
       example,  the  following  directs  mail	for user@foo.org via the slow transport to a mail
       exchanger for foo.org.  The slow transport could be something that runs at most one deliv-
       ery process at a time:

	    foo.org	 slow:

       When  no  transport  is	specified,  the  default  transport is used, as specified via the
       default_transport configuration parameter. The following sends all mail	for  foo.org  and
       its subdomains to host gateway.foo.org:

	    foo.org	 :[gateway.foo.org]
	    .foo.org	 :[gateway.foo.org]

       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 hostname:service instead of just a host:

	    foo.org	 smtp:bar.org:2025

       This directs mail for user@foo.org to host bar.org port 2025. Instead of a numerical  port
       a  symbolic  name  may  be  used.  Specify  []  around the hostname in order to disable MX

       The error mailer can be used to bounce mail:

	    .foo.org	  error:mail for *.foo.org is not deliverable

       This causes all mail for user@anything.foo.org to be bounced.

       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 reg-
       exp_table(5) or pcre_table(5).

       Each pattern is a regular expression that is applied to the entire domain being looked up.
       Thus, some.domain.hierarchy 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 paren-
       thesized substrings from the pattern can be interpolated as $1, $2 and so on.

       The  following  main.cf	parameters are especially relevant to this topic. See the Postfix
       main.cf file for syntax details and for default values. Use  the  postfix  reload  command
       after a configuration change.

	      List  of	Postfix features that use domain.tld patterns to match sub.domain.tld (as
	      opposed to requiring .domain.tld patterns).

	      List of transport lookup tables.

       Other parameters of interest:

	      The transport to use when no transport is explicitly specified.

	      The default host to send to when no transport table entry matches.

       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

       The Secure Mailer license must be distributed with this software.

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

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