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TRIVIAL-REWRITE(8postfix)                                               TRIVIAL-REWRITE(8postfix)

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_rewrite_domain  to  in-
                     complete  addresses.  Otherwise the result 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  mas-
                     ter.cf file.

              nexthop
                     The host to send to and optional delivery method information.

              recipient
                     The envelope recipient address that is passed on to nexthop.

              flags  The  address  class,  whether the address requires relaying, whether the ad-
                     dress 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-re-
       write  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 environ-
       ment.

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-re-
       write(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 includ-
       ing 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 with-
              out 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_mail-
       box_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,   $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; overrides non-local domains in re-
              cipient 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 verification.  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 as-
       pects of message routing for address verification probes, specify one or more of the  fol-
       lowing:

       address_verify_local_transport ($local_transport)
              Overrides the local_transport parameter setting for address verification 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 verification 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 verification probes.

       address_verify_transport_maps ($transport_maps)
              Overrides the transport_maps parameter setting for address verification probes.

       Available in Postfix version 2.3 and later:

       address_verify_sender_dependent_relayhost_maps ($sender_dependent_relayhost_maps)
              Overrides the sender_dependent_relayhost_maps parameter setting for address verifi-
              cation probes.

       Available in Postfix version 2.7 and later:

       address_verify_sender_dependent_default_transport_maps   ($sender_dependent_default_trans-
       port_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 configuration 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  incom-
              ing connection before terminating voluntarily.

       max_use (100)
              The  maximal number of incoming connections that a Postfix daemon process will ser-
              vice 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 ex-
              ample, "smtpd" becomes "prefix/smtpd".

       Available in Postfix version 2.0 and later:

       helpful_warnings (yes)
              Log warnings about problematic configuration settings, and provide helpful  sugges-
              tions.

       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
       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

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

                                                                        TRIVIAL-REWRITE(8postfix)

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