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trivial-rewrite


SYNOPSIS

       trivial-rewrite [generic Postfix daemon options]


DESCRIPTION

       The  trivial-rewrite  daemon  processes  two  types  of  client service
       requests:

       rewrite
              Rewrite an address to standard form. The trivial-rewrite  daemon
              by  default  appends  local  domain  information  to unqualified
              addresses, swaps bang paths to domain form,  and  strips  source
              routing  information.  This  process is under control of several
              configuration parameters (see below).

       resolve
              Resolve an address to a (transport, nexthop, recipient)  triple.
              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.


DEFAULT DELIVERY METHODS

       By default, Postfix uses one of the following delivery  methods.   This
       may  be  overruled  with  the optional transport(5) table.  The default
       delivery method is selected by matching the  recipient  address  domain
       against one of the following:

       $mydestination

       $inet_interfaces
              The   transport   and   optional   nexthop  are  specified  with
              $local_transport.  The default nexthop is the recipient  domain.

       $virtual_alias_domains
              The recipient address is undeliverable (user unknown).  By defi-
              nition, all known  addresses  in  a  virtual  alias  domain  are
              aliased to other addresses.

       $virtual_mailbox_domains
              The  transport  and  optional  nexthop  are specified with $vir-
              tual_transport.  The default nexthop is the recipient domain.

       $relay_domains
              The  transport  and  optional   nexthop   are   specified   with
              $relay_transport.  This  overrides the optional nexthop informa-
              tion that is specified with $relayhost.  The default nexthop  is
              the recipient domain.

       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 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).


BUGS


CONFIGURATION PARAMETERS

       The following main.cf parameters are especially relevant to  this  pro-
       gram.  See  the Postfix main.cf file for syntax details and for default
       values. Use the postfix reload command after a configuration change.


Miscellaneous

       empty_address_recipient
              The recipient that is substituted for the null address.

       inet_interfaces
              The network interfaces that this mail system receives  mail  on.
              This     information     is     used     to     determine     if
              user@[net.work.addr.ess] is local or  remote.   Mail  for  local
              users is given to the $local_transport.

       mydestination
              List of domains that are given to the $local_transport.

       virtual_alias_domains
              List  of  simulated virtual domains (domains with all recipients
              aliased to some other local or remote domain).

       virtual_mailbox_domains
              List of domains that are given to the $virtual_transport.

       relay_domains
              List of domains that are given to the $relay_transport.

       resolve_unquoted_address
              When resolving an address, do not quote the address localpart as
              per  RFC  822,  so  that additional @, % or !  characters remain
              visible. This is technically incorrect, but allows  us  to  stop
              relay  attacks  when  forwarding  mail  to a Sendmail primary MX
              host.

       relocated_maps
              Tables with contact information for users, hosts or domains that
              no longer exist. See relocated(5).

       append_dot_mydomain
              Rewrite user@host to user@host.$mydomain.

       swap_bangpath
              Rewrite site!user to user@site.


Routing

       local_transport
              Where to deliver mail for destinations that match $mydestination
              or $inet_interfaces.  The default  transport  is  local:$myhost-
              name.

              Syntax  is  transport:nexthop; see transport(5) for details. The
              :nexthop part is optional.

       virtual_transport
              Where to deliver mail for non-local  domains  that  match  $vir-
              tual_mailbox_domains.  The default transport is virtual.

              Syntax  is  transport:nexthop; see transport(5) for details. The
              :nexthop part is optional.

       relay_transport
              Where  to  deliver  mail  for  non-local  domains   that   match
              $relay_domains.   The default transport is relay (which normally
              is a clone of the smtp transport).

              Syntax is transport:nexthop; see transport(5) for  details.  The
              :nexthop part is optional.

       default_transport
              Where  to  deliver all other non-local mail.  The default trans-
              port is smtp.

              Syntax is transport:nexthop; see transport(5) for  details.  The
              :nexthop part is optional.

       parent_domain_matches_subdomains
              List  of  Postfix features that use domain.tld patterns to match
              sub.domain.tld (as opposed to requiring .domain.tld patterns).

       relayhost
              The default host to send non-local mail to when no host is spec-
              ified  with $relay_transport or $default_transport, and when the
              recipient address does not match the optional  the  transport(5)
              table.

       transport_maps
              List  of tables with recipient or domain to (transport, nexthop)
              mappings.


SEE ALSO

       master(8) process manager
       syslogd(8) system logging
       transport(5) transport table format

                                                            TRIVIAL-REWRITE(8)

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