NAME
trivial-rewrite - Postfix address rewriting and resolving daemonSYNOPSIS
trivial-rewrite [generic Postfix daemon options]
DESCRIPTION
The 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 $mydomain to incomplete addresses; do swap_bangpath and allow_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 $remote_header_rewrite_domain to incomplete addresses. Otherwise the result is identical to that of the local address rewriting context. This prevents Postfix from appending the local domain to spam from poorly written remote 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 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 sender address
- Resolve the address for address verification purposes.
SERVER PROCESS MANAGEMENT
The servers run under control by the Postfix master(8) 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 terminates after serving at least $max_use clients of after $max_idle seconds of idle time.
STANDARDS
None. The command does not interact with the outside world.
SECURITY
The daemon is not security sensitive. By default, this daemon does not talk to remote or local users. It can run at a fixed low privilege in a chrooted environment.
DIAGNOSTICS
Problems and transactions are logged to syslogd(8) or postlogd(8).
CONFIGURATION PARAMETERS
On busy mail systems a long time may pass before a main.cf change affecting is picked up. Use the command " postfix reload" to speed up a change.
COMPATIBILITY CONTROLS
- resolve_dequoted_address (yes)
- Resolve a recipient address safely instead of correctly, by looking inside quotes.
- resolve_null_domain (no)
- Resolve an address that ends in the "@" null domain as if the local hostname were specified, instead of rejecting the address as invalid.
- resolve_numeric_domain (no)
- Resolve "user@ipaddress" as "user@[ipaddress]", instead of rejecting the address as invalid.
- allow_min_user (no)
- Allow a sender or recipient address to have `-' as the first character.
ADDRESS REWRITING CONTROLS
- myorigin ($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 localpart, user name, or a .forward file name from its extension.
- swap_bangpath (yes)
- Enable the rewriting of "site!user" into "user@site".
- remote_header_rewrite_domain (empty)
- Don't rewrite message headers from remote clients at all when this parameter is empty; otherwise, rewrite message headers and append the specified 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: 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 remote delivery to domains listed with $relay_domains.
- default_transport (smtp)
- The default mail delivery transport and next-hop destination for destinations that do not match $mydestination, $inet_interfaces, $proxy_interfaces, $virtual_alias_domains, $virtual_mailbox_domains, or $relay_domains.
- parent_domain_matches_subdomains (see 'postconf -d' output)
- A list of Postfix features where the pattern "example.com" also matches subdomains of example.com, instead of requiring an explicit ".example.com" pattern.
- relayhost (empty)
- The next-hop destination(s) for non-local mail; overrides non-local domains in recipient addresses.
- transport_maps (empty)
- Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination).
- sender_dependent_relayhost_maps (empty)
- A sender-dependent override for the global relayhost parameter setting.
- empty_address_relayhost_maps_lookup_key (<>)
- The sender_dependent_relayhost_maps search string that will be used instead of the null sender address.
- empty_address_default_transport_maps_lookup_key (<>)
- The sender_dependent_default_transport_maps search string that will be used instead of the null sender address.
- sender_dependent_default_transport_maps (empty)
- A sender-dependent override for the global default_transport parameter setting.
ADDRESS VERIFICATION CONTROLS
Postfix version 2.1 introduces sender and recipient address verification. This feature is implemented by sending probe email messages that are not actually delivered. By default, address verification probes use the same route as regular mail. To override specific aspects of message routing for address verification probes, specify one or more of the following:
- address_verify_local_transport ($local_transport)
- Overrides the local_transport parameter setting for address 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 ($transport_maps)
- Overrides the transport_maps parameter setting for address verification probes.
- address_verify_sender_dependent_relayhost_maps ($sender_dependent_relayhost_maps)
- Overrides the sender_dependent_relayhost_maps parameter setting for address verification probes.
- address_verify_sender_dependent_default_transport_maps ($sender_dependent_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 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 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".
- helpful_warnings (yes)
- Log warnings about problematic configuration settings, and provide helpful suggestions.
- 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