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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 $remote_header_re-
		     write_domain to incomplete	addresses. Otherwise  the  re-
		     sult  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 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	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 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).

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
       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	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 (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 a	user name from its ex-
	      tension  (example:  user+foo),  or a .forward file name from its
	      extension	(example: .forward+foo).

       swap_bangpath (yes)
	      Enable the rewriting of "site!user" into "user@site".

       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, 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_do-
	      mains, or	$relay_domains.

       parent_domain_matches_subdomains	(see 'postconf -d' output)
	      What Postfix features match subdomains of	"domain.tld" automati-
	      cally, instead of	requiring an explicit ".domain.tld" pattern.

       relayhost (empty)
	      The  next-hop destination	of 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).

       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)
	      The  mail	 system	 name that is prepended	to the process name in
	      syslog records, so that "smtpd"  becomes,	 for  example,	"post-
	      fix/smtpd".

       Available in Postfix version 2.0	and later:

       helpful_warnings	(yes)
	      Log  warnings about problematic configuration settings, and pro-
	      vide 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
       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

							    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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