# 
# 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. After updating
#        this  table,  issue the postfix reload command to make the
#        change visible.
# 
#        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
# 
#                                                                 1
# 
# 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
#        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 destination in order to disable MX lookups.
# 
#        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@anythingfoo.org
#        to be bounced.
# 
#                                                                 2
# 
# TRANSPORT(5)                                         TRANSPORT(5)
# 
# 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
#        Yorktown Heights, NY 10598, USA
# 
#                                                                 3
# 
