QMQPD(8)                                                              QMQPD(8)

NAME
       qmqpd - Postfix QMQP server

SYNOPSIS
       qmqpd [generic Postfix daemon options]

DESCRIPTION
       The Postfix QMQP server receives one message per connection.  Each mes-
       sage 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  autho-
       rized 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 compo-
       nent 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 pro-
       gram. 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 logging level by the amount speci-
              fied 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,  including  on-disk
              storage for sender and recipient address information.

Tarpitting
       qmqpd_error_delay
              Time  to  wait in seconds before informing the client of a prob-
              lem. 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)