TRIVIAL-REWRITE(8)

NAME
trivial-rewrite - Postfix address rewriting and resolving daemon

SYNOPSIS
trivial-rewrite [generic Postfix daemon options]

DESCRIPTION
The trivial-rewrite daemon processes three 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 information.

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

verify
    Resolve an address for address verification purposes.

SERVER PROCESS MANAGEMENT
The trivial-rewrite 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 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).

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.

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.

ADDRESS REWRITING CONTROLS

myorigin ($myhostname)
    The default 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)
    Append the string "@$myorigin" to mail addresses without domain information.

append_dot_mydomain (yes)
    Append the string ".$mydomain" to addresses that have no ".domain" information.

recipient_delimiter (empty)
    The separator between user names and address extensions (user+foo).

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

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 for domains that match $mydestination, $inet_interfaces or $proxy_interfaces.

virtual_transport (virtual)
    The default mail delivery transport for domains that match the $virtual_mailbox_domains parameter value.

relay_transport (relay)
    The default mail delivery transport and next-hop information for domains that match the $relay_domains parameter value.

default_transport (smtp)
    The default mail delivery transport for 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)
    What Postfix features match subdomains of "domain.tld" automatically, instead of requiring an explicit ".domain.tld" pattern.

relayhost (empty)
    The default host to send non-local mail to when no entry is matched in the optional transport(5) table.

transport_maps (empty)
    Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop destination).

ADDRESS VERIFICATION CONTROLS
Postfix version 2.1 introduces sender and 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.

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 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 (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 settings, 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
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