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Postfix manual - qmqpd(8)

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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) 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 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 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 the next service request before exiting. max_use (100) The maximal number of connection requests before a Postfix daemon process terminates. 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 direc- tory. 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 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)

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