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
       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.

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
              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)
              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

       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

                                                                                                 QMQPD(8postfix)