QMQPD(8) QMQPD(8)
NAME
qmqpd - Postfix QMQP server
SYNOPSIS
qmqpd [generic Postfix daemon options]
DESCRIPTION
The Postfix QMQP server receives one message per connection. Each message is piped through the
cleanup(8) daemon, and is placed into the incoming queue as one single queue file. The program
expects to be run from the master(8) process manager.
The QMQP server implements one access policy: only explicitly authorized client hosts are allowed to
use the service.
SECURITY
The QMQP server is moderately security-sensitive. It talks to QMQP clients and to DNS servers on the
network. The QMQP server can be run chrooted at fixed low privilege.
DIAGNOSTICS
Problems and transactions are logged to syslogd(8).
BUGS
The QMQP protocol provides only one server reply per message delivery. It is therefore not possible
to reject individual recipients.
The QMQP protocol requires the server to receive the entire message before replying. If a message is
malformed, or if any netstring component is longer than acceptable, Postfix replies immediately and
closes the connection. It is left up to the client to handle the situation.
CONFIGURATION PARAMETERS
Changes to main.cf are picked up automatically, as qmqpd(8) processes run for only a limited amount
of time. 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 exam-ples. examples.
ples.
CONTENT INSPECTION CONTROLS
content_filter (empty)
The name of a mail delivery transport that filters mail after it is queued.
receive_override_options (empty)
Enable or disable recipient validation, built-in content filtering, or address mapping.
RESOURCE AND RATE CONTROLS
line_length_limit (2048)
Upon input, long lines are chopped up into pieces of at most this length; upon delivery, long
lines are reconstructed.
hopcount_limit (50)
The maximal number of Received: message headers that is allowed in the primary message head-ers. headers.
ers.
message_size_limit (10240000)
The maximal size in bytes of a message, including envelope information.
qmqpd_timeout (300s)
The time limit for sending or receiving information over the network.
TROUBLE SHOOTING CONTROLS
debug_peer_level (2)
The increment in verbose logging level when a remote client or server matches a pattern in the
debug_peer_list parameter.
debug_peer_list (empty)
Optional list of remote client or server hostname or network address patterns that cause the
verbose logging level to increase by the amount specified in $debug_peer_level.
soft_bounce (no)
Safety net to keep mail queued that would otherwise be returned to the sender.
TARPIT CONTROLS
qmqpd_error_delay (1s)
How long the QMQP server will pause before sending a negative reply to the client.
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.
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 connec-tion connection
tion before terminating voluntarily.
max_use (100)
The maximal number of incoming connections that a Postfix daemon process will service before
terminating voluntarily.
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.
qmqpd_authorized_clients (empty)
What clients are allowed to connect to the QMQP server port.
queue_directory (see 'postconf -d' output)
The location of the Postfix top-level queue directory.
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".
verp_delimiter_filter (-=+)
The characters Postfix accepts as VERP delimiter characters on the Postfix sendmail(1) command
line and in SMTP commands.
SEE ALSO
http://cr.yp.to/proto/qmqp.html QMQP protocol
cleanup(8), message canonicalization
master(8), process manager
syslogd(8), system logging
README FILES
Use "postconf readme_directory" or "postconf html_directory" to locate this information.
QMQP_README, Postfix ezmlm-idx howto.
LICENSE
The Secure Mailer license must be distributed with this software.
HISTORY
The qmqpd service was introduced with Postfix version 1.1.
AUTHOR(S)
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
QMQPD(8)
|