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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  daemon  processes  three  types of client service
       requests:

       rewrite
              Rewrite an address to standard form. The trivial-rewrite  daemon
              by  default  appends  local  domain  information  to unqualified
              addresses, swaps bang paths to domain form,  and  strips  source
              routing  information.  This  process is under control of several
              configuration parameters (see below).

       resolve
              Resolve an address to a (transport, nexthop, recipient)  triple.
              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.

       verify Resolve an address for address verification purposes.

SERVER PROCESS MANAGEMENT
       The trivial-rewrite 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 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.

       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 default 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)
              Append  the string "@$myorigin" to mail addresses without domain
              information.

       append_dot_mydomain (yes)
              Append  the  string  ".$mydomain"  to  addresses  that  have  no
              ".domain" information.

       recipient_delimiter (empty)
              The   separator   between  user  names  and  address  extensions
              (user+foo).

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

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  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, $vir-
              tual_alias_domains, $virtual_mailbox_domains, 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 default host to send non-local mail  to  when  no  entry  is
              matched in the optional transport(5) table.

       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  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.

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 the next service request before exiting.

       max_use (100)
              The  maximal number of connection requests before a Postfix dae-
              mon 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 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 (postfix)
              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)