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BOUNCE(8)                   System Manager's Manual                  BOUNCE(8)

       bounce - Postfix message bounce or defer daemon

       bounce [generic Postfix daemon options]

       The  bounce  daemon  maintains  per-message log files with non-delivery
       status information. Each log file is named after the queue file that it
       corresponds  to,  and  is  kept in a queue subdirectory named after the
       service name in the master.cf file (either  bounce,  defer  or  trace).
       This program expects to be run from the master(8) process manager.

       The bounce daemon processes two types of service requests:

       o      Append a recipient (non-)delivery status record to a per-message
              log file.

       o      Enqueue a bounce message, with a copy of a per-message log  file
              and  of  the  corresponding  message. When the bounce message is
              enqueued successfully, the per-message log file is deleted.

       The software does a best notification effort. A non-delivery  notifica-
       tion  is  sent even when the log file or the original message cannot be

       Optionally, a bounce (defer, trace) client can request  that  the  per-
       message  log  file be deleted when the requested operation fails.  This
       is used by clients that cannot retry transactions  by  themselves,  and
       that depend on retry logic in their own client.

       RFC 822 (ARPA Internet Text Messages)
       RFC 1894 (Delivery Status Notifications)
       RFC 2045 (Format of Internet Message Bodies)

       Problems and transactions are logged to syslogd(8).

       Changes  to main.cf are picked up automatically, as bounce(8) processes
       run for only a limited amount of time. Use the command "postfix reload"
       to speed up a change.

       The  text  below provides only a parameter summary. See postconf(5) for
       more details including examples.

       2bounce_notice_recipient (postmaster)
              The recipient of undeliverable mail that cannot be  returned  to
              the sender.

       backwards_bounce_logfile_compatibility (yes)
              Produce additional bounce(8) logfile records that can be read by
              older Postfix versions.

       bounce_notice_recipient (postmaster)
              The recipient of postmaster notifications with the message head-
              ers  of  mail that Postfix did not deliver and of SMTP conversa-
              tion transcripts of mail that Postfix did not receive.

       bounce_size_limit (50000)
              The maximal amount of original message text that is  sent  in  a
              non-delivery notification.

       config_directory (see 'postconf -d' output)
              The  default  location of the Postfix main.cf and master.cf con-
              figuration files.

       daemon_timeout (18000s)
              How much time a Postfix daemon process  may  take  to  handle  a
              request before it is terminated by a built-in watchdog timer.

       delay_notice_recipient (postmaster)
              The recipient of postmaster notifications with the message head-
              ers of mail that cannot be delivered within  $delay_warning_time
              time units.

       deliver_lock_attempts (20)
              The maximal number of attempts to acquire an exclusive lock on a
              mailbox file or bounce(8) logfile.

       deliver_lock_delay (1s)
              The time between attempts to acquire  an  exclusive  lock  on  a
              mailbox file or bounce(8) logfile.

       ipc_timeout (3600s)
              The  time  limit  for  sending  or receiving information over an
              internal communication channel.

       mail_name (Postfix)
              The mail system name that is displayed in Received: headers,  in
              the SMTP greeting banner, and in bounced mail.

       max_idle (100s)
              The  maximum  amount of time that an idle Postfix daemon process
              waits for the next service request before exiting.

       max_use (100)
              The maximal number of connection requests before a Postfix  dae-
              mon process terminates.

       notify_classes (resource, software)
              The list of error classes that are reported to the postmaster.

       process_id (read-only)
              The process ID of a Postfix command or daemon process.

       process_name (read-only)
              The process name of a Postfix command or daemon process.

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue directory.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (postfix)
              The  mail  system  name that is prepended to the process name in
              syslog records, so that "smtpd"  becomes,  for  example,  "post-

       /var/spool/postfix/bounce/* non-delivery records
       /var/spool/postfix/defer/* non-delivery records
       /var/spool/postfix/trace/* delivery status records

       qmgr(8), queue manager
       postconf(5), configuration parameters
       master(8), process manager
       syslogd(8), system logging

       The Secure Mailer license must be distributed with this software.

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