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Linux 2.6 - man page for transport (linux section 5)

TRANSPORT(5)									     TRANSPORT(5)

NAME
       transport - Postfix transport table format

SYNOPSIS
       postmap /etc/postfix/transport

       postmap -q "string" /etc/postfix/transport

       postmap -q - /etc/postfix/transport <inputfile

DESCRIPTION
       The optional transport(5) table specifies a mapping from email addresses to message deliv-
       ery transports and next-hop destinations.  Message delivery transports such  as	local  or
       smtp  are  defined in the master.cf file, and next-hop destinations are typically hosts or
       domain names. The table is searched by the trivial-rewrite(8) daemon.

       This mapping overrides the default transport:nexthop selection that is built into Postfix:

       local_transport (default: local:$myhostname)
	      This is the default for final delivery to domains listed	with  mydestination,  and
	      for  [ipaddress] destinations that match $inet_interfaces or $proxy_interfaces. The
	      default nexthop destination is the MTA hostname.

       virtual_transport (default: virtual:)
	      This is the default  for	final  delivery  to  domains  listed  with  virtual_mail-
	      box_domains. The default nexthop destination is the recipient domain.

       relay_transport (default: relay:)
	      This  is	the  default for remote delivery to domains listed with relay_domains. In
	      order of decreasing precedence, the nexthop destination is taken from  relay_trans-
	      port, sender_dependent_relayhost_maps, relayhost, or from the recipient domain.

       default_transport (default: smtp:)
	      This  is	the  default  for  remote  delivery  to  other destinations.  In order of
	      decreasing  precedence,  the  nexthop  destination  is  taken  from   sender_depen-
	      dent_default_transport_maps,   default_transport,  sender_dependent_relayhost_maps,
	      relayhost, or from the recipient domain.

       Normally, the transport(5) 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"  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  expressions,  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".

CASE FOLDING
       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 regexp: or pcre: whose lookup
       fields can match both upper and lower case.

TABLE FORMAT
       The input format for the postmap(1) command is as follows:

       pattern result
	      When pattern matches the recipient address or 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.

       The  pattern  specifies	an  email  address, a domain name, or a domain name hierarchy, as
       described in section "TABLE LOOKUP".

       The result is of the form transport:nexthop and specifies how or where  to  deliver  mail.
       This is described in section "RESULT FORMAT".

TABLE SEARCH ORDER
       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:

       user+extension@domain transport:nexthop
	      Deliver mail for user+extension@domain through transport to nexthop.

       user@domain transport:nexthop
	      Deliver mail for user@domain through transport to nexthop.

       domain transport:nexthop
	      Deliver mail for domain through transport to nexthop.

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

       * transport:nexthop
	      The  special  pattern  * represents any address (i.e. it functions as the wild-card
	      pattern, and is unique to Postfix transport tables).

       Note 1: the null recipient address is looked  up  as  $empty_address_recipient@$myhostname
       (default: mailer-daemon@hostname).

       Note 2: user@domain or user+extension@domain lookup is available in Postfix 2.0 and later.

RESULT FORMAT
       The  lookup result is of the form transport:nexthop.  The transport field specifies a mail
       delivery transport such as smtp or local. The nexthop 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 master.cf file).

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

       A null transport and null nexthop 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 transport field with a null nexthop field resets the nexthop information to the
       recipient domain.

       A  null transport field with non-null nexthop field does not modify the transport informa-
       tion.

EXAMPLES
       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.

	    my.domain	 :
	    .my.domain	 :
	    *		 smtp:outbound-relay.my.domain

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

	    example.com      uucp:example
	    .example.com     uucp:example

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

	    example.com      slow:

       When no transport is specified, Postfix uses the transport that matches the address domain
       class  (see DESCRIPTION above).	The following sends all mail for example.com and its sub-
       domains to host gateway.example.com:

	    example.com      :[gateway.example.com]
	    .example.com     :[gateway.example.com]

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

       In the case of delivery via SMTP, one may specify hostname:service instead of just a host:

	    example.com      smtp:bar.example:2025

       This directs mail for user@example.com to host bar.example port 2025. Instead of a numeri-
       cal 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:

	    .example.com     error:mail for *.example.com is not deliverable

       This causes all mail for user@anything.example.com 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 reg-
       exp_table(5) or pcre_table(5).

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

       Patterns are applied in the order as specified in the table, until a pattern is found that
       matches the search string.

       The trivial-rewrite(8) server disallows regular expression substitution of $1 etc. in reg-
       ular  expression  lookup  tables, because that could open a security hole (Postfix version
       2.3 and later).

TCP-BASED TABLES
       This section describes how the table lookups change when lookups are directed  to  a  TCP-
       based  server.  For  a  description  of the TCP client/server lookup protocol, see tcp_ta-
       ble(5).	This feature is not available up to and including Postfix version 2.4.

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

       Results are the same as with indexed file lookups.

CONFIGURATION PARAMETERS
       The  following main.cf parameters are especially relevant.  The text below provides only a
       parameter summary. See postconf(5) for more details including examples.

       empty_address_recipient
	      The address that is looked up instead of the null sender address.

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

       transport_maps
	      List of transport lookup tables.

SEE ALSO
       trivial-rewrite(8), rewrite and resolve addresses
       master(5), master.cf file format
       postconf(5), configuration parameters
       postmap(1), Postfix lookup table manager

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to locate this information.
       ADDRESS_REWRITING_README, address rewriting guide
       DATABASE_README, Postfix lookup table overview
       FILTER_README, external content filter

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

										     TRANSPORT(5)


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