185 lines
7.1 KiB
Plaintext
185 lines
7.1 KiB
Plaintext
# TRANSPORT(5) TRANSPORT(5)
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#
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# NAME
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# transport - format of Postfix transport table
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#
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# SYNOPSIS
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# postmap /etc/postfix/transport
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#
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# DESCRIPTION
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# The optional transport table specifies a mapping from
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# domain hierarchies to message delivery transports and/or
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# relay hosts. The mapping is used by the trivial-rewrite(8)
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# daemon.
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#
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# Normally, the transport table is specified as a text file
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# that serves as input to the postmap(1) command. The
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# result, an indexed file in dbm or db format, is used for
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# fast searching by the mail system. Execute the command
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# postmap /etc/postfix/transport in order to rebuild the
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# indexed file after changing the transport table.
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#
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# When the table is provided via other means such as NIS,
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# LDAP or SQL, the same lookups are done as for ordinary
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# indexed files.
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#
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# Alternatively, the table can be provided as a regular-
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# expression map where patterns are given as regular expres-
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# sions. In that case, the lookups are done in a slightly
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# different way as described below.
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#
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# TABLE FORMAT
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# The format of the transport table is as follows:
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#
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# pattern result
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# When pattern matches the domain, use the corre-
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# sponding result.
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#
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# blank lines and comments
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# Empty lines and whitespace-only lines are ignored,
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# as are lines whose first non-whitespace character
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# is a `#'.
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#
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# multi-line text
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# A logical line starts with non-whitespace text. A
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# line that starts with whitespace continues a logi-
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# cal line.
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#
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# With lookups from indexed files such as DB or DBM, or from
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# networked tables such as NIS, LDAP or SQL, patterns are
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# tried in the order as listed below:
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#
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# domain transport:nexthop
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# Mail for domain is delivered through transport to
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# nexthop.
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#
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# .domain transport:nexthop
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# Mail for any subdomain of domain is delivered
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# through transport to nexthop. This applies only
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# when the string transport_maps is not listed in the
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# parent_domain_matches_subdomains configuration set-
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# ting. Otherwise, a domain name matches itself and
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# its subdomains.
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#
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# Note: transport map entries take precedence over domains
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# specified in the mydestination parameter. If you use the
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# optional transport map, it may be safer to specify
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# explicit entries for all domains specified in mydestina-
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# tion, for example:
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#
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# hostname.my.domain local:
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# localhost.my.domain local:
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#
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# The interpretation of the nexthop field is transport
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# dependent. In the case of SMTP, specify host:service for a
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# non-default server port, and use [host] or [host]:port in
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# order to disable MX (mail exchanger) DNS lookups. The []
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# form can also be used with IP addresses instead of host-
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# names.
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#
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# EXAMPLES
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# In order to send mail for foo.org and its subdomains via
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# the uucp transport to the UUCP host named foo:
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#
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# foo.org uucp:foo
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# .foo.org uucp:foo
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#
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# When no nexthop host name is specified, the destination
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# domain name is used instead. For example, the following
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# directs mail for user@foo.org via the slow transport to a
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# mail exchanger for foo.org. The slow transport could be
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# something that runs at most one delivery process at a
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# time:
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#
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# foo.org slow:
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#
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# When no transport is specified, the default transport is
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# used, as specified via the default_transport configuration
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# parameter. The following sends all mail for foo.org and
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# its subdomains to host gateway.foo.org:
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#
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# foo.org :[gateway.foo.org]
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# .foo.org :[gateway.foo.org]
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#
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# In the above example, the [] are used to suppress MX
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# lookups. The result would likely point to your local
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# machine.
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#
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# In the case of delivery via SMTP, one may specify host-
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# name:service instead of just a host:
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#
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# foo.org smtp:bar.org:2025
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#
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# This directs mail for user@foo.org to host bar.org port
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# 2025. Instead of a numerical port a symbolic name may be
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# used. Specify [] around the hostname in order to disable
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# MX lookups.
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#
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# The error mailer can be used to bounce mail:
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#
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# .foo.org error:mail for *.foo.org is not deliv-
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# erable
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#
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# This causes all mail for user@anything.foo.org to be
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# bounced.
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#
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# REGULAR EXPRESSION TABLES
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# This section describes how the table lookups change when
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# the table is given in the form of regular expressions. For
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# a description of regular expression lookup table syntax,
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# see regexp_table(5) or pcre_table(5).
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#
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# Each pattern is a regular expression that is applied to
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# the entire domain being looked up. Thus, some.domain.hier-
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# archy is not broken up into parent domains.
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#
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# Patterns are applied in the order as specified in the
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# table, until a pattern is found that matches the search
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# string.
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#
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# Results are the same as with indexed file lookups, with
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# the additional feature that parenthesized substrings from
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# the pattern can be interpolated as $1, $2 and so on.
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#
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# CONFIGURATION PARAMETERS
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# The following main.cf parameters are especially relevant
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# to this topic. See the Postfix main.cf file for syntax
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# details and for default values. Use the postfix reload
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# command after a configuration change.
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#
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# parent_domain_matches_subdomains
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# List of Postfix features that use domain.tld pat-
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# terns to match sub.domain.tld (as opposed to
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# requiring .domain.tld patterns).
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#
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# transport_maps
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# List of transport lookup tables.
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#
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# Other parameters of interest:
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#
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# default_transport
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# The transport to use when no transport is explic-
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# itly specified.
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#
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# relayhost
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# The default host to send to when no transport table
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# entry matches.
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#
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# SEE ALSO
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# postmap(1) create mapping table
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# trivial-rewrite(8) rewrite and resolve addresses
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# pcre_table(5) format of PCRE tables
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# regexp_table(5) format of POSIX regular expression tables
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#
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# LICENSE
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# The Secure Mailer license must be distributed with this
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# software.
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#
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# AUTHOR(S)
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# Wietse Venema
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# IBM T.J. Watson Research
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# P.O. Box 704
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# Yorktown Heights, NY 10598, USA
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#
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# TRANSPORT(5)
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