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.

       Available with Postfix version 2.5 and later:

       allow_min_user (no)
              Allow  a sender or recipient address to have `-' as
              the first character.

       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.

       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

       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:

              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 (see 'postconf -d' output)
              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