QMQPD(8) QMQPD(8)
NAME
qmqpd - Postfix QMQP server
SYNOPSIS
qmqpd [generic Postfix daemon options]
DESCRIPTION
The Postfix QMQP server receives one message per connec-
tion. Each message is piped through the cleanup(8) dae-
mon, and is placed into the incoming queue as one single
queue file. The program expects to be run from the mas-
ter(8) process manager.
The QMQP server implements one access policy: only explic-
itly authorized client hosts are allowed to use the ser-
vice.
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 mes-
sage 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 examples.
CONTENT INSPECTION CONTROLS
content_filter (empty)
After the message is queued, send the entire mes-
sage 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.
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 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 termi-
nating 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 direc-
tory.
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
master(8), process manager
syslogd(8), system logging
README FILES
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)