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TRIVIAL-REWRITE(8) System Manager's Manual TRIVIAL-REWRITE(8) NAME trivial-rewrite - Postfix address rewriting and resolving daemon SYNOPSIS trivial-rewrite [generic Postfix daemon options] DESCRIPTION The trivial-rewrite(8) daemon processes three types of client service requests: rewrite context address Rewrite an address to standard form, according to the address rewriting context: local Append the domain names specified with $myorigin or $my- domain to incomplete addresses; do swap_bangpath and al- low_percent_hack processing as described below, and strip source routed addresses (@site,@site:user@domain) to user@domain form. remote Append the domain name specified with $re- mote_header_rewrite_domain to incomplete addresses. Oth- erwise the result is identical to that of the local ad- dress rewriting context. This prevents Postfix from ap- pending the local domain to spam from poorly written re- mote clients. resolve sender address Resolve the address to a (transport, nexthop, recipient, flags) quadruple. The meaning of the results is as follows: transport The delivery agent to use. This is the first field of an entry in the master.cf file. nexthop The host to send to and optional delivery method informa- tion. recipient The envelope recipient address that is passed on to nex- thop. flags The address class, whether the address requires relaying, whether the address has problems, and whether the request failed. verify sender address Resolve the address for address verification purposes. SERVER PROCESS MANAGEMENT The trivial-rewrite(8) servers run under control by the Postfix mas- ter(8) server. Each server can handle multiple simultaneous connec- tions. When all servers are busy while a client connects, the master creates a new server process, provided that the trivial-rewrite server process limit is not exceeded. Each trivial-rewrite server terminates after serving at least $max_use clients of after $max_idle seconds of idle time. STANDARDS None. The command does not interact with the outside world. SECURITY The trivial-rewrite(8) daemon is not security sensitive. By default, this daemon does not talk to remote or local users. It can run at a fixed low privilege in a chrooted environment. DIAGNOSTICS Problems and transactions are logged to syslogd(8) or postlogd(8). CONFIGURATION PARAMETERS On busy mail systems a long time may pass before a main.cf change af- fecting trivial-rewrite(8) is picked up. Use the command "postfix re- load" to speed up a change. The text below provides only a parameter summary. See postconf(5) for more details including examples. COMPATIBILITY CONTROLS resolve_dequoted_address (yes) Resolve a recipient address safely instead of correctly, by looking inside quotes. Available with Postfix version 2.1 and later: resolve_null_domain (no) Resolve an address that ends in the "@" null domain as if the local hostname were specified, instead of rejecting the address as invalid. Available with Postfix version 2.3 and later: resolve_numeric_domain (no) Resolve "user@ipaddress" as "user@[ipaddress]", instead of re- jecting the address as invalid. Available with Postfix version 2.5 and later: allow_min_user (no) Allow a sender or recipient address to have `-' as the first character. ADDRESS REWRITING CONTROLS myorigin ($myhostname) The domain name that locally-posted mail appears to come from, and that locally posted mail is delivered to. allow_percent_hack (yes) Enable the rewriting of the form "user%domain" to "user@domain". append_at_myorigin (yes) With locally submitted mail, append the string "@$myorigin" to mail addresses without domain information. append_dot_mydomain (Postfix >= 3.0: no, Postfix < 3.0: yes) With locally submitted mail, append the string ".$mydomain" to addresses that have no ".domain" information. recipient_delimiter (empty) The set of characters that can separate an email address local- part, user name, or a .forward file name from its extension. swap_bangpath (yes) Enable the rewriting of "site!user" into "user@site". Available in Postfix 2.2 and later: remote_header_rewrite_domain (empty) Rewrite or add message headers in mail from remote clients if the remote_header_rewrite_domain parameter value is non-empty, updating incomplete addresses with the domain specified in the remote_header_rewrite_domain parameter, and adding missing head- ers. ROUTING CONTROLS The following is applicable to Postfix version 2.0 and later. Earlier versions do not have support for: virtual_transport, relay_transport, virtual_alias_domains, virtual_mailbox_domains or proxy_interfaces. local_transport (local:$myhostname) The default mail delivery transport and next-hop destination for final delivery to domains listed with mydestination, and for [ipaddress] destinations that match $inet_interfaces or $proxy_interfaces. virtual_transport (virtual) The default mail delivery transport and next-hop destination for final delivery to domains listed with $virtual_mailbox_domains. relay_transport (relay) The default mail delivery transport and next-hop destination for the relay domain address class: recipient domains that match $relay_domains. default_transport (smtp) The default mail delivery transport and next-hop destination for the default domain class: recipient domains that do not match $mydestination, $inet_interfaces, $proxy_interfaces, $vir- tual_alias_domains, $virtual_mailbox_domains, or $relay_domains. parent_domain_matches_subdomains (see 'postconf -d' output) A list of Postfix features where the pattern "example.com" also matches subdomains of example.com, instead of requiring an ex- plicit ".example.com" pattern. relayhost (empty) The next-hop destination(s) for non-local mail; takes precedence over non-local domains in recipient addresses. transport_maps (empty) Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination). Available in Postfix version 2.3 and later: sender_dependent_relayhost_maps (empty) A sender-dependent override for the global relayhost parameter setting. Available in Postfix version 2.5 and later: empty_address_relayhost_maps_lookup_key (<>) The sender_dependent_relayhost_maps search string that will be used instead of the null sender address. Available in Postfix version 2.7 and later: empty_address_default_transport_maps_lookup_key (<>) The sender_dependent_default_transport_maps search string that will be used instead of the null sender address. sender_dependent_default_transport_maps (empty) A sender-dependent override for the global default_transport pa- rameter setting. ADDRESS VERIFICATION CONTROLS Postfix version 2.1 introduces sender and recipient address verifica- tion. This feature is implemented by sending probe email messages that are not actually delivered. By default, address verification probes use the same route as regular mail. To override specific aspects of message routing for address verification probes, specify one or more of the following: address_verify_local_transport ($local_transport) Overrides the local_transport parameter setting for address ver- ification probes. address_verify_virtual_transport ($virtual_transport) Overrides the virtual_transport parameter setting for address verification probes. address_verify_relay_transport ($relay_transport) Overrides the relay_transport parameter setting for address ver- ification probes. address_verify_default_transport ($default_transport) Overrides the default_transport parameter setting for address verification probes. address_verify_relayhost ($relayhost) Overrides the relayhost parameter setting for address verifica- tion probes. address_verify_transport_maps ($transport_maps) Overrides the transport_maps parameter setting for address veri- fication probes. Available in Postfix version 2.3 and later: address_verify_sender_dependent_relayhost_maps ($sender_dependent_re- layhost_maps) Overrides the sender_dependent_relayhost_maps parameter setting for address verification probes. Available in Postfix version 2.7 and later: address_verify_sender_dependent_default_transport_maps ($sender_depen- dent_default_transport_maps) Overrides the sender_dependent_default_transport_maps parameter setting for address verification probes. MISCELLANEOUS CONTROLS config_directory (see 'postconf -d' output) The default location of the Postfix main.cf and master.cf con- figuration files. daemon_timeout (18000s) How much time a Postfix daemon process may take to handle a re- quest before it is terminated by a built-in watchdog timer. empty_address_recipient (MAILER-DAEMON) The recipient of mail addressed to the null address. ipc_timeout (3600s) The time limit for sending or receiving information over an in- ternal communication channel. max_idle (100s) The maximum amount of time that an idle Postfix daemon process waits for an incoming connection before terminating voluntarily. max_use (100) The maximal number of incoming connections that a Postfix daemon process will service before terminating voluntarily. relocated_maps (empty) Optional lookup tables with new contact information for users or domains that no longer exist. process_id (read-only) The process ID of a Postfix command or daemon process. process_name (read-only) The process name of a Postfix command or daemon process. queue_directory (see 'postconf -d' output) The location of the Postfix top-level queue directory. show_user_unknown_table_name (yes) Display the name of the recipient table in the "User unknown" responses. syslog_facility (mail) The syslog facility of Postfix logging. syslog_name (see 'postconf -d' output) A prefix that is prepended to the process name in syslog records, so that, for example, "smtpd" becomes "prefix/smtpd". Available in Postfix version 2.0 and later: helpful_warnings (yes) Log warnings about problematic configuration settings, and pro- vide helpful suggestions. Available in Postfix 3.3 and later: service_name (read-only) The master.cf service name of a Postfix daemon process. SEE ALSO postconf(5), configuration parameters transport(5), transport table format relocated(5), format of the "user has moved" table master(8), process manager postlogd(8), Postfix logging syslogd(8), system logging README FILES Use "postconf readme_directory" or "postconf html_directory" to locate this information. ADDRESS_CLASS_README, Postfix address classes howto ADDRESS_VERIFICATION_README, Postfix address verification 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 TRIVIAL-REWRITE(8)
NAME | SYNOPSIS | DESCRIPTION | SERVER PROCESS MANAGEMENT | STANDARDS | SECURITY | DIAGNOSTICS | CONFIGURATION PARAMETERS | COMPATIBILITY CONTROLS | ADDRESS REWRITING CONTROLS | ROUTING CONTROLS | ADDRESS VERIFICATION CONTROLS | MISCELLANEOUS CONTROLS | SEE ALSO | README FILES | LICENSE | AUTHOR(S)
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