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OQMGR(8)                                                              OQMGR(8)

       oqmgr - old Postfix queue manager

       <b>oqmgr</b> [generic Postfix daemon options]

       The  <a href="qmgr.8.html"><b>oqmgr</b>(8)</a>  daemon  awaits the arrival of incoming mail
       and arranges for its delivery via  Postfix  delivery  pro-
       cesses.   The actual mail routing strategy is delegated to
       the <a href="trivial-rewrite.8.html"><b>trivial-rewrite</b>(8)</a> daemon.  This program expects to be
       run from the <a href="master.8.html"><b>master</b>(8)</a> process manager.

       Mail  addressed  to  the  local  <b>double-bounce</b>  address is
       logged and discarded.  This stops potential  loops  caused
       by undeliverable bounce notifications.

       The <a href="qmgr.8.html"><b>oqmgr</b>(8)</a> daemon maintains the following queues:

              Inbound mail from the network, or mail picked up by
              the local <a href="pickup.8.html"><b>pickup</b>(8)</a> agent from the <b>maildrop</b>  direc-

       <b>active</b> Messages  that  the  queue  manager  has opened for
              delivery. Only a  limited  number  of  messages  is
              allowed  to  enter  the  <b>active</b> queue (leaky bucket
              strategy, for a fixed delivery rate).

              Mail that could not be  delivered  upon  the  first
              attempt.  The  queue manager implements exponential
              backoff  by  doubling  the  time  between  delivery

              Unreadable  or  damaged  queue files are moved here
              for inspection.

       <b>hold</b>   Messages that are kept  "on  hold"  are  kept  here
              until someone sets them free.

       The  <a href="qmgr.8.html"><b>oqmgr</b>(8)</a>  daemon keeps an eye on per-message delivery
       status reports in the following directories.  Each  status
       report file has the same name as the corresponding message

       <b>bounce</b> Per-recipient status information about why mail  is
              bounced.    These   files  are  maintained  by  the
              <a href="bounce.8.html"><b>bounce</b>(8)</a> daemon.

       <b>defer</b>  Per-recipient status information about why mail  is
              delayed.    These   files  are  maintained  by  the
              <a href="defer.8.html"><b>defer</b>(8)</a> daemon.

       <b>trace</b>  Per-recipient status information as requested  with
              the  Postfix  "<b>sendmail  -v</b>" or "<b>sendmail -bv</b>" com-
              mand.  These files are maintained by  the  <a href="trace.8.html"><b>trace</b>(8)</a>

       The   <a href="qmgr.8.html"><b>oqmgr</b>(8)</a>   daemon  is  responsible  for  asking  the
       <a href="bounce.8.html"><b>bounce</b>(8)</a>, <a href="defer.8.html"><b>defer</b>(8)</a> or <a href="trace.8.html"><b>trace</b>(8)</a> daemons to  send  delivery

       The  queue  manager implements a variety of strategies for
       either opening queue files (input) or for message delivery

       <b>leaky bucket</b>
              This  strategy limits the number of messages in the
              <b>active</b> queue and prevents the  queue  manager  from
              running out of memory under heavy load.

              When  the  <b>active</b> queue has room, the queue manager
              takes one message from the <a href="QSHAPE_README.html#incoming_queue"><b>incoming</b> queue</a>  and  one
              from the <b>deferred</b> queue. This prevents a large mail
              backlog from blocking the delivery of new mail.

       <b>slow start</b>
              This strategy eliminates "thundering herd" problems
              by slowly adjusting the number of parallel deliver-
              ies to the same destination.

       <b>round robin</b>
              The queue manager sorts delivery requests by desti-
              nation.   Round-robin selection prevents one desti-
              nation from dominating deliveries to other destina-

       <b>exponential backoff</b>
              Mail  that  cannot  be  delivered  upon  the  first
              attempt is deferred.   The  time  interval  between
              delivery attempts is doubled after each attempt.

       <b>destination status cache</b>
              The   queue  manager  avoids  unnecessary  delivery
              attempts by  maintaining  a  short-term,  in-memory
              list of unreachable destinations.

       On an idle system, the queue manager waits for the arrival
       of trigger events, or it waits for a timer to  go  off.  A
       trigger  is  a one-byte message.  Depending on the message
       received, the queue manager performs one of the  following
       actions  (the message is followed by the symbolic constant
       used internally by the software):

       <b>D (QMGR_REQ_SCAN_DEFERRED)</b>
              Start a <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> scan.  If a  deferred  queue
              scan  is  already  in  progress,  that scan will be
              restarted as soon as it finishes.

       <b>I (QMGR_REQ_SCAN_INCOMING)</b>
              Start an <a href="QSHAPE_README.html#incoming_queue">incoming queue</a> scan. If an incoming  queue
              scan  is  already  in  progress,  that scan will be
              restarted as soon as it finishes.

       <b>A (QMGR_REQ_SCAN_ALL)</b>
              Ignore <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> file time stamps. The request
              affects the next <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> scan.

       <b>F (QMGR_REQ_FLUSH_DEAD)</b>
              Purge  all  information  about  dead transports and

       <b>W (TRIGGER_REQ_WAKEUP)</b>
              Wakeup call, This is used by the master  server  to
              instantiate  servers  that  should not go away for-
              ever. The action is  to  start  an  <a href="QSHAPE_README.html#incoming_queue">incoming  queue</a>

       The  <a href="qmgr.8.html"><b>oqmgr</b>(8)</a> daemon reads an entire buffer worth of trig-
       gers.  Multiple identical trigger requests  are  collapsed
       into  one, and trigger requests are sorted so that <b>A</b> and <b>F</b>
       precede <b>D</b> and <b>I</b>. Thus, in order to force a <a href="QSHAPE_README.html#deferred_queue">deferred  queue</a>
       run, one would request <b>A F D</b>; in order to notify the queue
       manager of the arrival of new mail one would request <b>I</b>.

       <a href="http://tools.ietf.org/html/rfc3463">RFC 3463</a> (Enhanced status codes)
       <a href="http://tools.ietf.org/html/rfc3464">RFC 3464</a> (Delivery status notifications)

       The <a href="qmgr.8.html"><b>oqmgr</b>(8)</a> daemon is not security  sensitive.  It  reads
       single-character  messages from untrusted local users, and
       thus may be susceptible to denial of service attacks.  The
       <a href="qmgr.8.html"><b>oqmgr</b>(8)</a> daemon does not talk to the outside world, and it
       can be run at fixed low privilege in a  chrooted  environ-

       Problems and transactions are logged to the <b>syslog</b>(8) dae-
       mon.  Corrupted message files are  saved  to  the  <b>corrupt</b>
       queue for further inspection.

       Depending  on the setting of the <b><a href="postconf.5.html#notify_classes">notify_classes</a></b> parameter,
       the postmaster is notified of bounces and of  other  trou-

       A  single  queue  manager  process has to compete for disk
       access  with  multiple   front-end   processes   such   as
       <a href="cleanup.8.html"><b>cleanup</b>(8)</a>.  A sudden burst of inbound mail can negatively
       impact outbound delivery rates.

       Changes to <a href="postconf.5.html"><b>main.cf</b></a> are not  picked  up  automatically,  as
       <a href="qmgr.8.html"><b>oqmgr</b>(8)</a> is a persistent process. Use the command "<b>postfix</b>
       <b>reload</b>" after a configuration change.

       The text below provides  only  a  parameter  summary.  See
       <a href="postconf.5.html"><b>postconf</b>(5)</a> for more details including examples.

       In  the text below, <i>transport</i> is the first field in a <b>mas-</b>
       <b>ter.cf</b> entry.

       Available before Postfix version 2.5:

       <b><a href="postconf.5.html#allow_min_user">allow_min_user</a> (no)</b>
              Allow a sender or recipient address to have `-'  as
              the first character.

       <b><a href="postconf.5.html#qmgr_clog_warn_time">qmgr_clog_warn_time</a> (300s)</b>
              The  minimal delay between warnings that a specific
              destination  is  clogging  up  the  Postfix  active

       <b><a href="postconf.5.html#qmgr_message_active_limit">qmgr_message_active_limit</a> (20000)</b>
              The maximal number of messages in the <a href="QSHAPE_README.html#active_queue">active queue</a>.

       <b><a href="postconf.5.html#qmgr_message_recipient_limit">qmgr_message_recipient_limit</a> (20000)</b>
              The maximal number of recipients held in memory  by
              the  Postfix queue manager, and the maximal size of
              the size of the short-term, in-memory "dead" desti-
              nation status cache.

       <b><a href="postconf.5.html#qmgr_fudge_factor">qmgr_fudge_factor</a> (100)</b>
              Obsolete   feature:   the  percentage  of  delivery
              resources that a busy mail system will use  up  for
              delivery of a large mailing  list message.

       <b><a href="postconf.5.html#initial_destination_concurrency">initial_destination_concurrency</a> (5)</b>
              The  initial  per-destination concurrency level for
              parallel delivery to the same destination.

       <b><a href="postconf.5.html#default_destination_concurrency_limit">default_destination_concurrency_limit</a> (20)</b>
              The default maximal number of  parallel  deliveries
              to the same destination.

       <b><a href="postconf.5.html#transport_destination_concurrency_limit"><i>transport</i>_destination_concurrency_limit</a> ($<a href="postconf.5.html#default_destination_concurrency_limit">default_destina</a>-</b>
       <b><a href="postconf.5.html#default_destination_concurrency_limit">tion_concurrency_limit</a>)</b>
              Idem, for delivery via the named message <i>transport</i>.

       Available in Postfix version 2.5 and later:

       <b><a href="postconf.5.html#transport_initial_destination_concurrency"><i>transport</i>_initial_destination_concurrency</a> ($<a href="postconf.5.html#initial_destination_concurrency">initial_desti</a>-</b>
       <b><a href="postconf.5.html#initial_destination_concurrency">nation_concurrency</a>)</b>
              Initial concurrency for delivery via the named mes-
              sage <i>transport</i>.

       <b><a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">default_destination_concurrency_failed_cohort_limit</a> (1)</b>
              How  many  pseudo-cohorts must suffer connection or
              handshake failure before a specific destination  is
              considered  unavailable  (and  further  delivery is

       <b><a href="postconf.5.html#transport_destination_concurrency_failed_cohort_limit"><i>transport</i>_destination_concurrency_failed_cohort_limit</a></b>
       <b>($<a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">default_destination_concurrency_failed_cohort_limit</a>)</b>
              Idem, for delivery via the named message <i>transport</i>.

       <b><a href="postconf.5.html#default_destination_concurrency_negative_feedback">default_destination_concurrency_negative_feedback</a> (1)</b>
              The  per-destination amount of delivery concurrency
              negative feedback, after a delivery completes  with
              a connection or handshake failure.

       <b><a href="postconf.5.html#transport_destination_concurrency_positive_feedback"><i>transport</i>_destination_concurrency_negative_feedback</a></b>
       <b>($<a href="postconf.5.html#default_destination_concurrency_negative_feedback">default_destination_concurrency_negative_feedback</a>)</b>
              Idem, for delivery via the named message <i>transport</i>.

       <b><a href="postconf.5.html#default_destination_concurrency_positive_feedback">default_destination_concurrency_positive_feedback</a> (1)</b>
              The per-destination amount of delivery  concurrency
              positive feedback, after a delivery completes with-
              out connection or handshake failure.

       <b><a href="postconf.5.html#transport_destination_concurrency_positive_feedback"><i>transport</i>_destination_concurrency_positive_feedback</a></b>
       <b>($<a href="postconf.5.html#default_destination_concurrency_positive_feedback">default_destination_concurrency_positive_feedback</a>)</b>
              Idem, for delivery via the named message <i>transport</i>.

       <b><a href="postconf.5.html#destination_concurrency_feedback_debug">destination_concurrency_feedback_debug</a> (no)</b>
              Make the queue manager's feedback algorithm verbose
              for performance analysis purposes.

       <b><a href="postconf.5.html#default_destination_recipient_limit">default_destination_recipient_limit</a> (50)</b>
              The default maximal number of recipients  per  mes-
              sage delivery.

       <b><a href="postconf.5.html#transport_destination_recipient_limit"><i>transport</i>_destination_recipient_limit</a></b>
              Idem, for delivery via the named message <i>transport</i>.

       <b><a href="postconf.5.html#minimal_backoff_time">minimal_backoff_time</a> (300s)</b>
              The minimal time  between  attempts  to  deliver  a
              deferred  message; prior to Postfix 2.4 the default
              value was 1000s.

       <b><a href="postconf.5.html#maximal_backoff_time">maximal_backoff_time</a> (4000s)</b>
              The maximal time  between  attempts  to  deliver  a
              deferred message.

       <b><a href="postconf.5.html#maximal_queue_lifetime">maximal_queue_lifetime</a> (5d)</b>
              The  maximal  time a message is queued before it is
              sent back as undeliverable.

       <b><a href="postconf.5.html#queue_run_delay">queue_run_delay</a> (300s)</b>
              The time between <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> scans by the  queue
              manager; prior to Postfix 2.4 the default value was

       <b><a href="postconf.5.html#transport_retry_time">transport_retry_time</a> (60s)</b>
              The time between attempts by the Postfix queue man-
              ager  to  contact a malfunctioning message delivery

       Available in Postfix version 2.1 and later:

       <b><a href="postconf.5.html#bounce_queue_lifetime">bounce_queue_lifetime</a> (5d)</b>
              The maximal time a bounce message is queued  before
              it is considered undeliverable.

       Available in Postfix version 2.5 and later:

       <b><a href="postconf.5.html#default_destination_rate_delay">default_destination_rate_delay</a> (0s)</b>
              The  default  amount  of  delay  that  is  inserted
              between individual deliveries to the same  destina-
              tion;  with  per-destination recipient limit &gt; 1, a
              destination is a domain, otherwise it is a  recipi-

       <b><a href="postconf.5.html#transport_destination_rate_delay"><i>transport</i>_destination_rate_delay</a>         $<a href="postconf.5.html#default_destination_rate_delay">default_destina</a>-</b>
       <b><a href="postconf.5.html#default_destination_rate_delay">tion_rate_delay</a></b>
              Idem, for delivery via the named message <i>transport</i>.

       <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
              The default location of  the  Postfix  <a href="postconf.5.html">main.cf</a>  and
              <a href="master.5.html">master.cf</a> configuration files.

       <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
              How  much time a Postfix daemon process may take to
              handle a request  before  it  is  terminated  by  a
              built-in watchdog timer.

       <b><a href="postconf.5.html#defer_transports">defer_transports</a> (empty)</b>
              The  names  of  message  delivery  transports  that
              should  not  deliver  mail  unless  someone  issues
              "<b>sendmail -q</b>" or equivalent.

       <b><a href="postconf.5.html#delay_logging_resolution_limit">delay_logging_resolution_limit</a> (2)</b>
              The  maximal  number  of  digits  after the decimal
              point when logging sub-second delay values.

       <b><a href="postconf.5.html#helpful_warnings">helpful_warnings</a> (yes)</b>
              Log warnings about problematic  configuration  set-
              tings, and provide helpful suggestions.

       <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
              The time limit for sending or receiving information
              over an internal communication channel.

       <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
              The process ID  of  a  Postfix  command  or  daemon

       <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
              The  process  name  of  a Postfix command or daemon

       <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b>
              The location of the Postfix top-level queue  direc-

       <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
              The syslog facility of Postfix logging.

       <b><a href="postconf.5.html#syslog_name">syslog_name</a> (postfix)</b>
              The  mail  system  name  that  is  prepended to the
              process name in syslog  records,  so  that  "smtpd"
              becomes, for example, "postfix/smtpd".

       /var/spool/postfix/incoming, <a href="QSHAPE_README.html#incoming_queue">incoming queue</a>
       /var/spool/postfix/active, <a href="QSHAPE_README.html#active_queue">active queue</a>
       /var/spool/postfix/deferred, <a href="QSHAPE_README.html#deferred_queue">deferred queue</a>
       /var/spool/postfix/bounce, non-delivery status
       /var/spool/postfix/defer, non-delivery status
       /var/spool/postfix/trace, delivery status

<b>SEE ALSO</b>
       <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a>, address routing
       <a href="bounce.8.html">bounce(8)</a>, delivery status reports
       <a href="postconf.5.html">postconf(5)</a>, configuration parameters
       <a href="master.5.html">master(5)</a>, generic daemon options
       <a href="master.8.html">master(8)</a>, process manager
       syslogd(8), system logging

       <a href="QSHAPE_README.html">QSHAPE_README</a>, Postfix queue analysis

       The Secure Mailer license must be  distributed  with  this

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

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