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Postfix manual - trivial-rewrite(8)

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TRIVIAL-REWRITE(8) 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 $myo- rigin or $mydomain to incomplete addresses; do swap_bangpath and allow_percent_hack pro- cessing as described below, and strip source routed addresses (@site,@site:[email protected]) to [email protected] form. remote Append the domain name specified with $remote_header_rewrite_domain to incomplete addresses. Otherwise the result is identical to that of the local address rewriting con- text. This prevents Postfix from appending the local domain to spam from poorly written remote clients. resolve address Resolve an address to a (transport, nexthop, recip- ient, 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 information. recipient The envelope recipient address that is passed on to nexthop. flags The address class, whether the address requires relaying, whether the address has problems, and whether the request failed. verify address Resolve an address for address verification pur- poses. SERVER PROCESS MANAGEMENT The trivial-rewrite(8) servers run under control by the Postfix master server. Each server can handle multiple simultaneous connections. 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 termi- nates after serving at least $max_use clients of after $max_idle seconds of idle time. STANDARDS None. The command does not interact with the outside world. SECURITY The trivial-rewrite(8) daemon is not security sensitive. By default, this daemon does not talk to remote or local users. It can run at a fixed low privilege in a chrooted environment. DIAGNOSTICS Problems and transactions are logged to syslogd(8). CONFIGURATION PARAMETERS On busy mail systems a long time may pass before a main.cf change affecting trivial-rewrite(8) is picked up. Use the command "postfix reload" to speed up a change. The text below provides only a parameter summary. See postconf(5) for more details including examples. COMPATIBILITY CONTROLS resolve_dequoted_address (yes) Resolve a recipient address safely instead of cor- rectly, by looking inside quotes. resolve_null_domain (no) Resolve an address that ends in the "@" null domain as if the local hostname were specified, instead of rejecting the address as invalid. ADDRESS REWRITING CONTROLS myorigin ($myhostname) The domain name that locally-posted mail appears to come from, and that locally posted mail is deliv- ered to. allow_percent_hack (yes) Enable the rewriting of the form "user%domain" to "[email protected]". append_at_myorigin (yes) With locally submitted mail, append the string "@$myorigin" to mail addresses without domain information. append_dot_mydomain (yes) With locally submitted mail, append the string ".$mydomain" to addresses that have no ".domain" information. recipient_delimiter (empty) The separator between user names and address exten- sions (user+foo). swap_bangpath (yes) Enable the rewriting of "site!user" into "[email protected]". Available in Postfix 2.2 and later: remote_header_rewrite_domain (empty) Don't rewrite message headers from remote clients at all when this parameter is empty; otherwise, re- write remote message headers and append the speci- fied domain name to incomplete addresses. ROUTING CONTROLS The following is applicable to Postfix version 2.0 and later. Earlier versions do not have support for: vir- tual_transport, relay_transport, virtual_alias_domains, virtual_mailbox_domains or proxy_interfaces. local_transport (local:$myhostname) The default mail delivery transport for domains that match $mydestination, $inet_interfaces or $proxy_interfaces. virtual_transport (virtual) The default mail delivery transport for domains that match the $virtual_mailbox_domains parameter value. relay_transport (relay) The default mail delivery transport and next-hop information for domains that match the $relay_domains parameter value. default_transport (smtp) The default mail delivery transport for domains that do not match $mydestination, $inet_interfaces, $proxy_interfaces, $virtual_alias_domains, $vir- tual_mailbox_domains, or $relay_domains. parent_domain_matches_subdomains (see 'postconf -d' out- put) What Postfix features match subdomains of "domain.tld" automatically, instead of requiring an explicit ".domain.tld" pattern. relayhost (empty) The default host to send non-local mail to when no entry is matched in the optional transport(5) ta- ble. transport_maps (empty) Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination). ADDRESS VERIFICATION CONTROLS Postfix version 2.1 introduces sender and recipient address verification. This feature is implemented by sending probe email messages that are not actually deliv- ered. By default, address verification probes use the same route as regular mail. To override specific aspects of message routing for address verification probes, spec- ify one or more of the following: address_verify_local_transport ($local_transport) Overrides the local_transport parameter setting for address verification 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 verification 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 verification probes. address_verify_transport_maps ($transport_maps) Overrides the 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 configuration files. daemon_timeout (18000s) How much time a Postfix daemon process may take to handle a request 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 internal communication channel. max_idle (100s) The maximum amount of time that an idle Postfix daemon process waits for the next service request before exiting. max_use (100) The maximal number of connection requests before a Postfix daemon process terminates. 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 direc- tory. 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 (postfix) The mail system name that is prepended to the process name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd". Available in Postfix version 2.0 and later: helpful_warnings (yes) Log warnings about problematic configuration set- tings, and provide helpful suggestions. SEE ALSO postconf(5), configuration parameters transport(5), transport table format relocated(5), format of the "user has moved" table master(8), process manager syslogd(8), system logging README FILES 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 TRIVIAL-REWRITE(8)

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