Postfix manual - trivial-rewrite(8)

    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  $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_re-
                         write_domain  to  incomplete  addresses.  Otherwise   the
                         result  is identical to that of the local address rewrit-
                         ing 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
           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 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
                  rejecting 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 a  user  name  from  its
                  extension  (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_mail-
                  box_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 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
                  parameter 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_depen-
           dent_relayhost_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
                  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".

           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
           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

           Wietse Venema
           Google, Inc.
           111 8th Avenue
           New York, NY 10011, USA

                                                                TRIVIAL-REWRITE(8)