Provided by: postfix_3.7.4-2build1_amd64 
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) or postlogd(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 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.
SMTPUTF8 CONTROLS
Preliminary SMTPUTF8 support is introduced with Postfix 3.0.
smtputf8_enable (yes)
Enable preliminary SMTPUTF8 support for the protocols described in RFC 6531..6533.
smtputf8_autodetect_classes (sendmail, verify)
Detect that a message requires SMTPUTF8 support for the specified mail origin
classes.
Available in Postfix version 3.2 and later:
enable_idna2003_compatibility (no)
Enable 'transitional' compatibility between IDNA2003 and IDNA2008, when converting
UTF-8 domain names to/from the ASCII form that is used for DNS lookups.
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 nexthop destination, remote client or
server name or network address matches a pattern given with the debug_peer_list
parameter.
debug_peer_list (empty)
Optional list of nexthop destination, remote client or server name or network
address patterns that, if matched, 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 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 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)
A prefix that is prepended to the process name in syslog records, so that, for
example, "smtpd" becomes "prefix/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.
Available in Postfix 3.3 and later:
service_name (read-only)
The master.cf service name of a Postfix daemon process.
SEE ALSO
http://cr.yp.to/proto/qmqp.html, QMQP protocol
cleanup(8), message canonicalization
master(8), process manager
postlogd(8), Postfix logging
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
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA
QMQPD(8postfix)