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  mas-
       ter(8)  server.   Each  server can handle multiple simultaneous connec-
       tions.  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) or postlogd(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 an email address  local-
              part, user name, or a .forward file name from its extension.

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

       Available in Postfix 2.2 and later:

       remote_header_rewrite_domain (empty)
              Rewrite  or  add  message headers in mail from remote clients if
              the remote_header_rewrite_domain parameter value  is  non-empty,
              updating  incomplete  addresses with the domain specified in the
              remote_header_rewrite_domain parameter, and adding missing head-
              ers.

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
              the  relay  domain  address  class: recipient domains that match
              $relay_domains.

       default_transport (smtp)
              The default mail delivery transport and next-hop destination for
              the  default  domain  class: recipient 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)
              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; takes precedence
              over 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
       postlogd(8), Postfix logging
       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)