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)