NAME
transport - Postfix transport table formatSYNOPSIS
postmap /etc/postfix/transport postmap -q "string" /etc/postfix/transport postmap -q - /etc/postfix/transport <inputfile
DESCRIPTION
The optional table specifies a mapping from email addresses to message delivery 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.
- 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_mailbox_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_transport, 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_dependent_default_transport_maps, default_transport, sender_dependent_relayhost_maps, relayhost, or from the recipient domain.
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.
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_subdomains 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).
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.
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
example.com uucp:example .example.com uucp:example
example.com slow:
example.com :[gateway.example.com] .example.com :[gateway.example.com]
example.com smtp:bar.example:2025
example.com smtp:bar.example, foo.example
.example.com error:mail for *.example.com is not deliverable
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).
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_table(5). This feature is not available up to and including Postfix version 2.4.
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 (MAILER-DAEMON)
- The recipient of mail addressed to the null address.
- parent_domain_matches_subdomains (see 'postconf -d' output)
- A list of Postfix features where the pattern "example.com" also matches subdomains of example.com, instead of requiring an explicit ".example.com" pattern.
- transport_maps (empty)
- Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination).
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 Wietse Venema Google, Inc. 111 8th Avenue New York, NY 10011, USA