TRIVIAL-REWRITE(8) System Manager's Manual TRIVIAL-REWRITE(8)
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 server. Each server can handle multi‐
ple 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 $max_idle seconds of idle time.
STANDARDS
None. The command does not interact with the outside world.
SECURITY
The trivial-rewrite(8) daemon is not security sensitive. By default, this daemon does not talk to remote or
local users. It can run at a fixed low privilege in a chrooted environment.
DIAGNOSTICS
Problems and transactions are logged to syslogd(8).
CONFIGURATION PARAMETERS
resolve_numeric_domain (no)
Resolve "user@ipaddress" as "user@[ipaddress]", instead of rejecting the address as invalid.
Available with Postfix version 2.5 and later:
allow_min_user (no)
Allow a sender or recipient address to have `-' as the first character.
ADDRESS REWRITING CONTROLS
myorigin ($myhostname)
The domain name that locally-posted mail appears to come from, and that locally posted mail is deliv‐
ered 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 "@$myorigin" to mail addresses without domain informa‐
tion.
append_dot_mydomain (yes)
With locally submitted mail, append the string ".$mydomain" to addresses that have no ".domain" infor‐
mation.
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".
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.
ROUTING CONTROLS
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] 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 remote delivery to domains listed with
$relay_domains.
default_transport (smtp)
Optional lookup tables with mappings from recipient address to (message delivery transport, next-hop
destination).
Available in Postfix version 2.3 and later:
sender_dependent_relayhost_maps (empty)
A sender-dependent override for the global relayhost parameter setting.
Available in Postfix version 2.5 and later:
empty_address_relayhost_maps_lookup_key (<>)
The sender_dependent_relayhost_maps search string that will be used instead of the null sender address.
Available in Postfix version 2.7 and later:
empty_address_default_transport_maps_lookup_key (<>)
The sender_dependent_default_transport_maps search string that will be used instead of the null sender
address.
sender_dependent_default_transport_maps (empty)
A sender-dependent override for the global default_transport parameter setting.
ADDRESS VERIFICATION CONTROLS
Postfix version 2.1 introduces sender and recipient address verification. This feature is implemented by
sending probe email messages that are not actually delivered. By default, address verification probes use the
same route as regular mail. To override specific aspects of message routing for address verification probes,
specify one or more of the following:
address_verify_local_transport ($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)
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 terminat‐
ing 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)
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.
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