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TRANSPORT(5)                                                      TRANSPORT(5)

       transport - Postfix transport table format

       <b>postmap /etc/postfix/transport</b>

       <b>postmap -q "</b><i>string</i><b>" /etc/postfix/transport</b>

       <b>postmap -q - /etc/postfix/transport</b> &lt;<i>inputfile</i>

       The  optional  <a href="transport.5.html"><b>transport</b>(5)</a> table specifies a mapping from
       email addresses to message delivery transports  and  next-
       hop  destinations.   Message  delivery  transports such as
       <b>local</b> or <b>smtp</b> are defined in the <a href="master.5.html"><b></b></a> file, and next-
       hop  destinations are typically hosts or domain names. The
       table is searched by the <a href="trivial-rewrite.8.html"><b>trivial-rewrite</b>(8)</a> daemon.

       This  mapping  overrides  the  default   <i>transport</i>:<i>nexthop</i>
       selection that is built into Postfix:

       <b><a href="postconf.5.html#local_transport">local_transport</a> (default: <a href="local.8.html">local</a>:$<a href="postconf.5.html#myhostname">myhostname</a>)</b>
              This  is  the default for final delivery to domains
              listed with <b><a href="postconf.5.html#mydestination">mydestination</a></b>, and for [<i>ipaddress</i>] des-
              tinations    that    match    <b>$<a href="postconf.5.html#inet_interfaces">inet_interfaces</a></b>   or
              <b>$<a href="postconf.5.html#proxy_interfaces">proxy_interfaces</a></b>. The default <i>nexthop</i>  destination
              is the MTA hostname.

       <b><a href="postconf.5.html#virtual_transport">virtual_transport</a> (default: <a href="virtual.8.html">virtual</a>:)</b>
              This  is  the default for final delivery to domains
              listed with  <b><a href="postconf.5.html#virtual_mailbox_domains">virtual_mailbox_domains</a></b>.  The  default
              <i>nexthop</i> destination is the recipient domain.

       <b><a href="postconf.5.html#relay_transport">relay_transport</a> (default: relay:)</b>
              This  is the default for remote delivery to domains
              listed with <b><a href="postconf.5.html#relay_domains">relay_domains</a></b>. In order  of  decreasing
              precedence,  the  <i>nexthop</i> destination is taken from
              <b><a href="postconf.5.html#relay_transport">relay_transport</a></b>,   <b><a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a></b>,
              <b><a href="postconf.5.html#relayhost">relayhost</a></b>, or from the recipient domain.

       <b><a href="postconf.5.html#default_transport">default_transport</a> (default: <a href="smtp.8.html">smtp</a>:)</b>
              This  is  the  default for remote delivery to other
              destinations.  In order of  decreasing  precedence,
              the    <i>nexthop</i>    destination    is    taken   from
              <b><a href="postconf.5.html#default_transport">default_transport</a></b>, <b><a href="postconf.5.html#sender_dependent_relayhost_maps">sender_dependent_relayhost_maps</a></b>,
              <b><a href="postconf.5.html#relayhost">relayhost</a></b>, or from the recipient domain.

       Normally,  the  <a href="transport.5.html"><b>transport</b>(5)</a>  table is specified as a text
       file that serves as input to the <a href="postmap.1.html"><b>postmap</b>(1)</a> command.   The
       result,  an  indexed file in <b>dbm</b> or <b>db</b> format, is used for
       fast searching by the mail  system.  Execute  the  command
       "<b>postmap  /etc/postfix/transport</b>"  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".

       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 <a href="regexp_table.5.html">regexp</a>: or <a href="pcre_table.5.html">pcre</a>: whose
       lookup fields can match both upper and lower case.

       The input format for the <a href="postmap.1.html"><b>postmap</b>(1)</a> command is as follows:

       <i>pattern result</i>
              When  <i>pattern</i>  matches  the  recipient  address  or
              domain, use the corresponding <i>result</i>.

       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 <i>pattern</i> specifies an email address, a domain name,  or
       a  domain  name  hierarchy, as described in section "TABLE

       The <i>result</i> is of the form <i>transport:nexthop</i> and  specifies
       how or where to deliver mail. This is described in section

       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:

       <i>user+extension@domain transport</i>:<i>nexthop</i>
              Deliver  mail  for  <i>user+extension@domain</i>   through
              <i>transport</i> to <i>nexthop</i>.

       <i>user@domain transport</i>:<i>nexthop</i>
              Deliver  mail  for <i>user@domain</i> through <i>transport</i> to

       <i>domain transport</i>:<i>nexthop</i>
              Deliver mail for <i>domain</i> through <i>transport</i>  to  <i>nex-</i>

       <i>.domain transport</i>:<i>nexthop</i>
              Deliver  mail  for  any subdomain of <i>domain</i> through
              <i>transport</i> to <i>nexthop</i>. This applies  only  when  the
              string  <b><a href="postconf.5.html#transport_maps">transport_maps</a></b>  is  not  listed in the <b><a href="postconf.5.html#parent_domain_matches_subdomains">par</a>-</b>
              <b><a href="postconf.5.html#parent_domain_matches_subdomains">ent_domain_matches_subdomains</a></b>  configuration   set-
              ting.   Otherwise, a domain name matches itself and
              its subdomains.

       Note 1: the special pattern <b>*</b> represents any address (i.e.
       it functions as the wild-card pattern).

       Note  2:  the  null  recipient  address  is  looked  up as
       <b>$<a href="postconf.5.html#empty_address_recipient">empty_address_recipient</a></b>@<b>$<a href="postconf.5.html#myhostname">myhostname</a></b> (default: mailer-dae-

       Note  3:  <i>user@domain</i>  or  <i>user+extension@domain</i> lookup is
       available in Postfix 2.0 and later.

       The lookup result is of the form  <i>transport</i><b>:</b><i>nexthop</i>.   The
       <i>transport</i>  field  specifies a mail delivery transport such
       as <b>smtp</b> or <b>local</b>. The <i>nexthop</i> 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 <a href="master.5.html"><b></b></a> file).

       The  interpretation  of  the  nexthop  field  is transport
       dependent. In the case of SMTP, specify  a  service  on  a
       non-default  port  as  <i>host</i>:<i>service</i>,  and disable MX (mail
       exchanger) DNS lookups with [<i>host</i>] or [<i>host</i>]:<i>port</i>. The  []
       form is required when you specify an IP address instead of
       a hostname.

       A null <i>transport</i> and null <i>nexthop</i>  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  <i>transport</i>  field  with  a  null <i>nexthop</i> field
       resets the nexthop information to the recipient domain.

       A null <i>transport</i> field with non-null  <i>nexthop</i>  field  does
       not modify the transport information.

       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.

            <b>my.domain    :</b>
            <b>.my.domain   :</b>
            <b>*            <a href="smtp.8.html">smtp</a></b>

       In  order  to send mail for <b></b> and its subdomains
       via the <b>uucp</b> transport to the UUCP host named <b>example</b>:

            <b>      uucp:example</b>
            <b>     uucp:example</b>

       When no nexthop host name is  specified,  the  destination
       domain  name  is  used instead. For example, the following
       directs mail for <i>user</i>@<b></b> via the  <b>slow</b>  transport
       to  a  mail exchanger for <b></b>.  The <b>slow</b> transport
       could be configured to run at most one delivery process at
       a time:

            <b>      slow:</b>

       When no transport is specified, Postfix uses the transport
       that matches the address  domain  class  (see  DESCRIPTION
       above).   The following sends all mail for <b></b> and
       its subdomains to host <b></b>:

            <b>      :[]</b>
            <b>     :[]</b>

       In the above example, the [] suppress  MX  lookups.   This
       prevents  mail  routing loops when your machine is primary
       MX host for <b></b>.

       In the case of delivery via SMTP, one  may  specify  <i>host-</i>
       <i>name</i>:<i>service</i> instead of just a host:

            <b>      <a href="smtp.8.html">smtp</a>:bar.example:2025</b>

       This directs mail for <i>user</i>@<b></b> to host <b>bar.example</b>
       port <b>2025</b>. 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:

            <b>     <a href="error.8.html">error</a>:mail for * is not deliverable</b>

       This causes all mail for <i>user</i>@<i>anything</i><b></b>  to  be

       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 <a href="regexp_table.5.html"><b>regexp_table</b>(5)</a> or <a href="pcre_table.5.html"><b>pcre_table</b>(5)</a>.

       Each pattern is a regular expression that  is  applied  to
       the    entire    address    being    looked    up.   Thus,
       <i>some.domain.hierarchy</i> is not  looked  up  via  its  parent
       domains,  nor is <i>user+foo@domain</i> looked up as <i>user@domain</i>.

       Patterns are applied in the order as specified in the  ta-
       ble,  until  a  pattern  is  found that matches the search

       The <a href="trivial-rewrite.8.html"><b>trivial-rewrite</b>(8)</a> 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).

       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 <a href="tcp_table.5.html"><b>tcp_ta-</b></a>
       <a href="tcp_table.5.html"><b>ble</b>(5)</a>.  This feature is not available up to and including
       Postfix version 2.4.

       Each  lookup  operation  uses the entire recipient address
       once.  Thus, <i>some.domain.hierarchy</i> is not  looked  up  via
       its  parent  domains,  nor is <i>user+foo@domain</i> looked up as

       Results are the same as with indexed file lookups.

       The following <a href="postconf.5.html"><b></b></a> parameters are especially  relevant.
       The  text  below  provides  only  a parameter summary. See
       <a href="postconf.5.html"><b>postconf</b>(5)</a> for more details including examples.

       <b><a href="postconf.5.html#empty_address_recipient">empty_address_recipient</a></b>
              The address that is looked up instead of  the  null
              sender address.

       <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a></b>
              List  of  Postfix features that use <i>domain.tld</i> pat-
              terns  to  match  <i>sub.domain.tld</i>  (as  opposed   to
              requiring <i>.domain.tld</i> patterns).

       <b><a href="postconf.5.html#transport_maps">transport_maps</a></b>
              List of transport lookup tables.

<b>SEE ALSO</b>
       <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a>, rewrite and resolve addresses
       <a href="master.5.html">master(5)</a>, <a href="master.5.html"></a> file format
       <a href="postconf.5.html">postconf(5)</a>, configuration parameters
       <a href="postmap.1.html">postmap(1)</a>, Postfix lookup table manager

       <a href="ADDRESS_REWRITING_README.html">ADDRESS_REWRITING_README</a>, address rewriting guide
       <a href="DATABASE_README.html">DATABASE_README</a>, Postfix lookup table overview
       <a href="FILTER_README.html">FILTER_README</a>, external content filter

       The Secure Mailer license must be  distributed  with  this

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

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