Ubuntu Manpage: trivial-rewrite - Postfix address rewriting and resolving daemon

Provided by: postfix_3.10.2-1ubuntu1_amd64

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 incomplete
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 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 purposes.

SERVER PROCESS MANAGEMENT

       The trivial-rewrite(8) servers run under control by the Postfix master(8) 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  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 environment.

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-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 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 without 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 an email address localpart, user name, or a .forward file
              name from its extension.

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

       Available in Postfix 2.2 and later:

       remote_header_rewrite_domain (empty)
              Rewrite or add message headers in mail from remote  clients  if  the  remote_header_rewrite_domain
              parameter  value  is  non-empty,  updating  incomplete  addresses with the domain specified in the
              remote_header_rewrite_domain parameter, and adding missing headers.

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_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]   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 the relay domain  address  class:
              recipient domains that match $relay_domains.

       default_transport (smtp)
              The  default  mail  delivery  transport  and  next-hop  destination  for the default domain class:
              recipient  domains  that  do  not  match  $mydestination,   $inet_interfaces,   $proxy_interfaces,
              $virtual_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;  takes  precedence  over 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 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 aspects of message routing for address
verification probes, specify 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 ($sender_dependent_relayhost_maps)
Overrides the sender_dependent_relayhost_maps parameter setting for address verification probes.

Available in Postfix version 2.7 and later:

address_verify_sender_dependent_default_transport_maps ($sender_dependent_default_transport_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 incoming connection
before terminating voluntarily.

max_use (100)
The maximal number of incoming connections that a Postfix daemon process will service 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 example, "smtpd"
becomes "prefix/smtpd".

Available in Postfix version 2.0 and later:

helpful_warnings (yes)
Log warnings about problematic configuration settings, and provide helpful suggestions.

Available in Postfix 3.3 and later:

service_name (read-only)
The master.cf service name of a Postfix daemon process.

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(8)