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 $myo-
                         rigin  or $mydomain to incomplete addresses;
                         do swap_bangpath and allow_percent_hack pro-
                         cessing 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  incomplete
                         addresses. Otherwise the result is identical
                         to that of the local address rewriting  con-
                         text.  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 information.

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

                  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  pur-
                  poses.

    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 termi-
           nates  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 cor-
                  rectly, 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.

           resolve_numeric_domain (no)
                  Resolve  "user@ipaddress"  as   "user@[ipaddress]",
                  instead of rejecting the address as invalid.

    ADDRESS REWRITING CONTROLS
           myorigin ($myhostname)
                  The domain name that locally-posted mail appears to
                  come from, and that locally posted mail  is  deliv-
                  ered 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 (yes)
                  With locally  submitted  mail,  append  the  string
                  ".$mydomain"  to  addresses  that have no ".domain"
                  information.

           recipient_delimiter (empty)
                  The separator between user names and address exten-
                  sions (user+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, re-
                  write 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:  vir-
           tual_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]  destina-
                  tions  that match $inet_interfaces or $proxy_inter-
                  faces.

           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_inter-
                  faces,    $virtual_alias_domains,    $virtual_mail-
                  box_domains, or $relay_domains.

           parent_domain_matches_subdomains (see 'postconf  -d'  out-
           put)
                  What   Postfix   features   match   subdomains   of
                  "domain.tld" automatically, instead of requiring an
                  explicit ".domain.tld" pattern.

           relayhost (empty)
                  The next-hop destination of non-local  mail;  over-
                  rides 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 relay-
                  host 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  deliv-
           ered.   By  default,  address  verification probes use the
           same route as regular mail. To override  specific  aspects
           of  message routing for address verification probes, spec-
           ify one or more of the following:

           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 (empty)
                  Overrides    the    sender_dependent_relayhost_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 the next  service  request
                  before exiting.

           max_use (100)
                  The  maximal number of connection requests before a
                  Postfix daemon 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 direc-
                  tory.

           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, "postfix/smtpd".

           Available in Postfix version 2.0 and later:

           helpful_warnings (yes)
                  Log  warnings  about problematic configuration set-
                  tings, and provide 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)