1QMQPD(8)                    System Manager's Manual                   QMQPD(8)
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NAME

6       qmqpd - Postfix QMQP server
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SYNOPSIS

9       qmqpd [generic Postfix daemon options]
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DESCRIPTION

12       The Postfix QMQP server receives one message per connection.  Each mes‐
13       sage is piped through the cleanup(8) daemon, and  is  placed  into  the
14       incoming queue as one single queue file.  The program expects to be run
15       from the master(8) process manager.
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17       The QMQP server implements one access policy:  only  explicitly  autho‐
18       rized client hosts are allowed to use the service.
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SECURITY

21       The  QMQP  server  is  moderately  security-sensitive. It talks to QMQP
22       clients and to DNS servers on the network. The QMQP server can  be  run
23       chrooted at fixed low privilege.
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DIAGNOSTICS

26       Problems and transactions are logged to syslogd(8).
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BUGS

29       The  QMQP protocol provides only one server reply per message delivery.
30       It is therefore not possible to reject individual recipients.
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32       The QMQP protocol requires the server to  receive  the  entire  message
33       before  replying. If a message is malformed, or if any netstring compo‐
34       nent is longer than acceptable, Postfix replies immediately and  closes
35       the connection. It is left up to the client to handle the situation.
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CONFIGURATION PARAMETERS

38       Changes  to  main.cf are picked up automatically, as qmqpd(8) processes
39       run for only a limited amount of time. Use the command "postfix reload"
40       to speed up a change.
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42       The  text  below provides only a parameter summary. See postconf(5) for
43       more details including examples.
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CONTENT INSPECTION CONTROLS

46       content_filter (empty)
47              After the message is queued, send  the  entire  message  to  the
48              specified transport:destination.
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50       receive_override_options (empty)
51              Enable or disable recipient validation, built-in content filter‐
52              ing, or address mapping.
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SMTPUTF8 CONTROLS

55       Preliminary SMTPUTF8 support is introduced with Postfix 3.0.
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57       smtputf8_enable (yes)
58              Enable preliminary SMTPUTF8 support for the protocols  described
59              in RFC 6531..6533.
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61       smtputf8_autodetect_classes (sendmail, verify)
62              Detect  that  a message requires SMTPUTF8 support for the speci‐
63              fied mail origin classes.
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65       Available in Postfix version 3.2 and later:
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67       enable_idna2003_compatibility (no)
68              Enable  'transitional'  compatibility   between   IDNA2003   and
69              IDNA2008,  when  converting UTF-8 domain names to/from the ASCII
70              form that is used for DNS lookups.
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RESOURCE AND RATE CONTROLS

73       line_length_limit (2048)
74              Upon input, long lines are chopped up into  pieces  of  at  most
75              this length; upon delivery, long lines are reconstructed.
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77       hopcount_limit (50)
78              The maximal number of Received:  message headers that is allowed
79              in the primary message headers.
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81       message_size_limit (10240000)
82              The maximal size in  bytes  of  a  message,  including  envelope
83              information.
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85       qmqpd_timeout (300s)
86              The  time  limit  for  sending or receiving information over the
87              network.
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TROUBLE SHOOTING CONTROLS

90       debug_peer_level (2)
91              The increment in verbose logging level when a remote  client  or
92              server matches a pattern in the debug_peer_list parameter.
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94       debug_peer_list (empty)
95              Optional  list  of  remote  client or server hostname or network
96              address  patterns  that  cause  the  verbose  logging  level  to
97              increase by the amount specified in $debug_peer_level.
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99       soft_bounce (no)
100              Safety  net to keep mail queued that would otherwise be returned
101              to the sender.
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TARPIT CONTROLS

104       qmqpd_error_delay (1s)
105              How long the Postfix QMQP server will  pause  before  sending  a
106              negative reply to the remote QMQP client.
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MISCELLANEOUS CONTROLS

109       config_directory (see 'postconf -d' output)
110              The  default  location of the Postfix main.cf and master.cf con‐
111              figuration files.
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113       daemon_timeout (18000s)
114              How much time a Postfix daemon process  may  take  to  handle  a
115              request before it is terminated by a built-in watchdog timer.
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117       ipc_timeout (3600s)
118              The  time  limit  for  sending  or receiving information over an
119              internal communication channel.
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121       max_idle (100s)
122              The maximum amount of time that an idle Postfix  daemon  process
123              waits for an incoming connection before terminating voluntarily.
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125       max_use (100)
126              The maximal number of incoming connections that a Postfix daemon
127              process will service before terminating voluntarily.
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129       process_id (read-only)
130              The process ID of a Postfix command or daemon process.
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132       process_name (read-only)
133              The process name of a Postfix command or daemon process.
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135       qmqpd_authorized_clients (empty)
136              What remote QMQP clients are allowed to connect to  the  Postfix
137              QMQP server port.
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139       queue_directory (see 'postconf -d' output)
140              The location of the Postfix top-level queue directory.
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142       syslog_facility (mail)
143              The syslog facility of Postfix logging.
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145       syslog_name (see 'postconf -d' output)
146              A  prefix  that  is  prepended  to  the  process  name in syslog
147              records, so that, for example, "smtpd" becomes "prefix/smtpd".
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149       verp_delimiter_filter (-=+)
150              The characters Postfix accepts as VERP delimiter  characters  on
151              the Postfix sendmail(1) command line and in SMTP commands.
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153       Available in Postfix version 2.5 and later:
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155       qmqpd_client_port_logging (no)
156              Enable logging of the remote QMQP client port in addition to the
157              hostname and IP address.
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159       Available in Postfix 3.3 and later:
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161       service_name (read-only)
162              The master.cf service name of a Postfix daemon process.
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SEE ALSO

165       http://cr.yp.to/proto/qmqp.html, QMQP protocol
166       cleanup(8), message canonicalization
167       master(8), process manager
168       syslogd(8), system logging
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README FILES

171       Use "postconf readme_directory" or "postconf html_directory" to  locate
172       this information.
173       QMQP_README, Postfix ezmlm-idx howto.
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LICENSE

176       The Secure Mailer license must be distributed with this software.
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HISTORY

179       The qmqpd service was introduced with Postfix version 1.1.
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AUTHOR(S)

182       Wietse Venema
183       IBM T.J. Watson Research
184       P.O. Box 704
185       Yorktown Heights, NY 10598, USA
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187       Wietse Venema
188       Google, Inc.
189       111 8th Avenue
190       New York, NY 10011, USA
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194                                                                      QMQPD(8)
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