Updated: 2022/Sep/29

Please read Privacy Policy. It's for your privacy.

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

       bounce - Postfix delivery status reports

       bounce [generic Postfix daemon options]

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

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

       ⊕      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
       notification 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.

       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)

       Problems and transactions are logged to syslogd(8) or postlogd(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
              Postfix versions before 2.0.

       bounce_notice_recipient (postmaster)
              The recipient of postmaster notifications with the message
              headers of mail that Postfix did not deliver and of SMTP
              conversation 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
              configuration 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
              headers 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
              specified 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.

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

       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

       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

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