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 &ge; 2.12: no, Postfix < 2.12: 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)
              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
       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)