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qmqpd



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

       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_delay
              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)
  
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