QMQPD(8) System Manager's Manual 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 mal‐
formed, 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 examples.
CONTENT INSPECTION CONTROLS
content_filter (empty)
After the message is queued, send the entire message to the specified transport:destination.
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 headers.
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.
TARPIT CONTROLS
qmqpd_error_delay (1s)
How long the Postfix QMQP server will pause before sending a negative reply to the remote QMQP 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 connection before
terminating voluntarily.
max_use (100)
The maximal number of incoming connections that a Postfix daemon process will service before terminat‐
ing 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 remote QMQP clients are allowed to connect to the Postfix 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 (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".
verp_delimiter_filter (-=+)
The characters Postfix accepts as VERP delimiter characters on the Postfix sendmail(1) command line and
in SMTP commands.
Available in Postfix version 2.5 and later:
qmqpd_client_port_logging (no)
Enable logging of the remote QMQP client port in addition to the hostname and IP address.
SEE ALSO
http://cr.yp.to/proto/qmqp.html, QMQP protocol
cleanup(8), message canonicalization
AUTHOR(S)
Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
QMQPD(8)
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