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

       trivial-rewrite  - Postfix address rewriting and resolving

       trivial-rewrite [generic Postfix daemon options]

       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:

                     The delivery agent to use. This is the first
                     field of an entry in the file.

                     The host to send to  and  optional  delivery
                     method information.

                     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-

       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.

       None. The command  does  not  interact  with  the  outside

       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

       Problems and transactions are logged to syslogd(8).

       On busy mail systems a long time may pass before a
       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.

       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.

       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

       append_at_myorigin (yes)
              With locally  submitted  mail,  append  the  string
              "@$myorigin"   to  mail  addresses  without  domain

       append_dot_mydomain (yes)
              With locally  submitted  mail,  append  the  string
              ".$mydomain"  to  addresses  that have no ".domain"

       recipient_delimiter (empty)
              The separator between user names and address exten-
              sions (user+foo).

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

       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.

       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-

       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-
              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

       Available in Postfix version 2.3 and later:

       sender_dependent_relayhost_maps (empty)
              A  sender-dependent  override for the global relay-
              host parameter setting.

       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.

       config_directory (see 'postconf -d' output)
              The default location of  the  Postfix  and
     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

       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  termi-
              nating 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_name (read-only)
              The  process  name  of  a Postfix command or daemon

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue  direc-

       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.

       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

       ADDRESS_CLASS_README, Postfix address classes howto
       ADDRESS_VERIFICATION_README, Postfix address verification

       The Secure Mailer license must be  distributed  with  this

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA