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TRANSPORT(5)                                         TRANSPORT(5)


NAME
       transport - format of Postfix transport table

SYNOPSIS
       postmap /etc/postfix/transport

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

       Normally, the file serves as input to the postmap(1)  com-
       mand.  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 expres-
       sions. In that case, the lookups are done  in  a  slightly
       different way as described below.

TABLE FORMAT
       The format of the transport table is as follows:

       blanks and comments
              Blank  lines  are  ignored,  as are lines beginning
              with `#'.

       pattern result
              When pattern matches the  domain,  use  the  corre-
              sponding result.

       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.

       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



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TRANSPORT(5)                                         TRANSPORT(5)


       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, specify 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 host-
       names.

EXAMPLES
       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 delivery 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 host-
       name: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 lookups.

       The error mailer can be used to bounce mail:

            .foo.org       error:mail for *.foo.org is not deliv-
       erable



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TRANSPORT(5)                                         TRANSPORT(5)


       This causes  all  mail  for  user@anything.foo.org  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 domain being looked up. Thus, some.domain.hier-
       archy 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 normal indexed file  lookups,
       with  the additional feature that parenthesized substrings
       from the pattern can be interpolated as $1, $2 and so  on.

CONFIGURATION PARAMETERS
       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.

       transport_maps
              List of transport lookup tables.

       Other parameters of interest:

       default_transport
              The transport to use when no transport  is  explic-
              itly specified.

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

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
       The Secure Mailer license must be  distributed  with  this
       software.

AUTHOR(S)
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704



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TRANSPORT(5)                                         TRANSPORT(5)


       Yorktown Heights, NY 10598, USA
























































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