    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
           The  following  main.cf parameters are especially relevant
           to this program. See the Postfix main.cf file  for  syntax
           details  and  for  default  values. Use the postfix reload
           command after a configuration change.

    Miscellaneous
           always_bcc
                  Address to send a copy of each message that  enters
                  the system.

           debug_peer_level
                  Increment  in  verbose  logging level when a remote
                  host  matches  a  pattern  in  the  debug_peer_list
                  parameter.

           debug_peer_list
                  List  of  domain or network patterns. When a remote
                  host matches a pattern, increase the  verbose  log-
                  ging   level   by   the  amount  specified  in  the
                  debug_peer_level parameter.

           hopcount_limit
                  Limit the number of Received: message headers.

           qmqpd_authorized_clients
                  A list of domain or network patterns that specifies
                  what clients are allowed to use the service.

           qmqpd_timeout
                  Limit  the  time  to  send a server response and to
                  receive a client request.

           soft_bounce
                  Change hard (D)  reject  responses  into  soft  (Z)
                  reject  responses.   This can be useful for testing
                  purposes.

    Content inspection controls
           content_filter
                  The name of a mail delivery transport that  filters
                  mail and that either bounces mail or re-injects the
                  result back into Postfix.  This parameter uses  the
                  same  syntax  as  the  right-hand side of a Postfix
                  transport table.

    Resource controls
           line_length_limit
                  Limit the amount of memory in bytes  used  for  the
                  handling  of partial input lines, and the length of
                  sender and recipient addresses  that  are  received
                  from client.

           message_size_limit
                  Limit the total size in bytes of a message, includ-
                  ing  on-disk  storage  for  sender  and   recipient
                  address information.

    Tarpitting
           qmqpd_error_sleep_time
                  Time to wait in seconds before informing the client
                  of a problem. This slows down run-away errors.

    SEE ALSO
           http://cr.yp.to/proto/qmqp.html, QMQP protocol
           cleanup(8) message canonicalization
           master(8) process manager
           syslogd(8) system logging

    LICENSE
           The Secure Mailer license must be  distributed  with  this
           software.

    AUTHOR(S)
           Wietse Venema
           IBM T.J. Watson Research
           P.O. Box 704
           Yorktown Heights, NY 10598, USA

                                                             QMQPD(8)