    BOUNCE(8)                                                            BOUNCE(8)

    NAME
           bounce - Postfix delivery status reports

    SYNOPSIS
           bounce [generic Postfix daemon options]

    DESCRIPTION
           The bounce(8) daemon maintains per-message log files with delivery sta-
           tus 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(8) daemon processes two types of service requests:

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

           o      Enqueue a delivery status notification message, with a copy of a
                  per-message log file and of the corresponding message.  When the
                  delivery status notification 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
           read.

           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.

    STANDARDS
           RFC 822 (ARPA Internet Text Messages)
           RFC 2045 (Format of Internet Message Bodies)
           RFC 2822 (Internet Message Format)
           RFC 3462 (Delivery Status Notifications)
           RFC 3464 (Delivery Status Notifications)
           RFC 3834 (Auto-Submitted: message header)
           RFC 5322 (Internet Message Format)
           RFC 6531 (Internationalized SMTP)
           RFC 6532 (Internationalized Message Format)
           RFC 6533 (Internationalized Delivery Status Notifications)

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8) or postlogd(8).

    CONFIGURATION PARAMETERS
           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
                  Postfix versions before 2.0.

           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.

           bounce_template_file (empty)
                  Pathname of a configuration file with bounce message  templates.

           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.

           internal_mail_filter_classes (empty)
                  What  categories  of  Postfix-generated  mail  are  subject   to
                  before-queue    content    inspection    by   non_smtpd_milters,
                  header_checks and body_checks.

           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 an incoming connection before terminating voluntarily.

           max_use (100)
                  The maximal number of incoming connections that a Postfix daemon
                  process will service before terminating voluntarily.

           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 (see 'postconf -d' output)
                  A prefix that  is  prepended  to  the  process  name  in  syslog
                  records, so that, for example, "smtpd" becomes "prefix/smtpd".

           Available in Postfix 3.0 and later:

           smtputf8_autodetect_classes (sendmail, verify)
                  Detect  that  a message requires SMTPUTF8 support for the speci-
                  fied mail origin classes.

           Available in Postfix 3.3 and later:

           service_name (read-only)
                  The master.cf service name of a Postfix daemon process.

           Available in Postfix 3.6 and later:

           enable_threaded_bounces (no)
                  Enable non-delivery, success, and delay notifications that  link
                  to   the   original  message  by  including  a  References:  and
                  In-Reply-To: header with the original Message-ID value.

           Available in Postfix 3.7 and later:

           header_from_format (standard)
                  The format of the Postfix-generated From: header.

           Available in Postfix 3.10 and later:

           tls_required_enable (yes)
                  Enable  support  for  the  "TLS-Required:  no"  message  header,
                  defined in RFC 8689.

           Available in Postfix 3.11 and later:

           requiretls_redact_dsn (yes)
                  When sending a delivery status notification for an original mes-
                  sage received with the REQUIRETLS option, do not send the origi-
                  nal   message  body  (as  if  that  message  was  received  with
                  "RET=HDRS") and do not enforce REQUIRETLS (as  if  that  message
                  was received without REQUIRETLS).

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

    SEE ALSO
           bounce(5), bounce message template format
           qmgr(8), queue manager
           postconf(5), configuration parameters
           master(5), generic daemon options
           master(8), process manager
           postlogd(8), Postfix logging
           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

           Wietse Venema
           Google, Inc.
           111 8th Avenue
           New York, NY 10011, USA

           Wietse Venema
           porcupine.org

                                                                         BOUNCE(8)