qmqpd - Unix, Linux Command
NAME
qmqpd
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Postfix QMQP server
SYNOPSIS
qmqpd [generic Postfix daemon options]
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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 examples.
CONTENT INSPECTION CONTROLS
| Tag | Description |
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content_filter (empty)
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The name of a mail delivery transport that filters mail after
it is queued.
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receive_override_options (empty)
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Enable or disable recipient validation, built-in content
filtering, or address mapping.
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RESOURCE AND RATE CONTROLS
| Tag | Description |
|---|
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line_length_limit (2048)
|
Upon input, long lines are chopped up into pieces of at most
this length; upon delivery, long lines are reconstructed.
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hopcount_limit (50)
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The maximal number of Received: message headers that is allowed
in the primary message headers.
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message_size_limit (10240000)
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The maximal size in bytes of a message, including envelope information.
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qmqpd_timeout (300s)
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The time limit for sending or receiving information over the network.
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TROUBLE SHOOTING CONTROLS
| Tag | Description |
|---|
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debug_peer_level (2)
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The increment in verbose logging level when a remote client or
server matches a pattern in the debug_peer_list parameter.
|
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debug_peer_list (empty)
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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.
|
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soft_bounce (no)
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Safety net to keep mail queued that would otherwise be returned to
the sender.
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TARPIT CONTROLS
| Tag | Description |
|---|
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qmqpd_error_delay (1s)
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How long the QMQP server will pause before sending a negative reply
to the client.
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MISCELLANEOUS CONTROLS
| Tag | Description |
|---|
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config_directory (see ’postconf -d’ output)
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The default location of the Postfix main.cf and master.cf
configuration files.
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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.
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ipc_timeout (3600s)
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The time limit for sending or receiving information over an internal
communication channel.
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max_idle (100s)
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The maximum amount of time that an idle Postfix daemon process
waits for the next service request before exiting.
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max_use (100)
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The maximal number of connection requests before a Postfix daemon
process terminates.
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process_id (read-only)
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The process ID of a Postfix command or daemon process.
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process_name (read-only)
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The process name of a Postfix command or daemon process.
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qmqpd_authorized_clients (empty)
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What clients are allowed to connect to the QMQP server port.
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queue_directory (see ’postconf -d’ output)
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The location of the Postfix top-level queue directory.
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syslog_facility (mail)
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The syslog facility of Postfix logging.
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syslog_name (postfix)
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The mail system name that is prepended to the process name in syslog
records, so that "smtpd" becomes, for example, "postfix/smtpd".
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verp_delimiter_filter (-=+)
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The characters Postfix accepts as VERP delimiter characters on the
Postfix sendmail(1) command line and in SMTP commands.
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SEE ALSO
README FILES
Use "
postconf readme_directory" or
"
postconf html_directory" to locate this information.
QMQP_README, Postfix ezmlm-idx howto.
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LICENSET
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
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