{ "mode": "man", "parameter": "defer", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/defer/8/json", "generated": "2026-08-15T23:16:49Z", "synopsis": "bounce [generic Postfix daemon options]", "sections": { "NAME": { "content": "bounce - Postfix delivery status reports\n", "subsections": [] }, "SYNOPSIS": { "content": "bounce [generic Postfix daemon options]\n", "subsections": [] }, "DESCRIPTION": { "content": "The bounce(8) daemon maintains per-message log files with delivery status information. Each\nlog file is named after the queue file that it corresponds to, and is kept in a queue subdi‐\nrectory named after the service name in the master.cf file (either bounce, defer or trace).\nThis program expects to be run from the master(8) process manager.\n\nThe bounce(8) daemon processes two types of service requests:\n\n• Append a recipient (non-)delivery status record to a per-message log file.\n\n• Enqueue a delivery status notification message, with a copy of a per-message log file\nand of the corresponding message. When the delivery status notification message is\nenqueued successfully, the per-message log file is deleted.\n\nThe software does a best notification effort. A non-delivery notification is sent even when\nthe log file or the original message cannot be read.\n\nOptionally, a bounce (defer, trace) client can request that the per-message log file be\ndeleted when the requested operation fails. This is used by clients that cannot retry trans‐\nactions by themselves, and that depend on retry logic in their own client.\n", "subsections": [] }, "STANDARDS": { "content": "RFC 822 (ARPA Internet Text Messages)\nRFC 2045 (Format of Internet Message Bodies)\nRFC 2822 (Internet Message Format)\nRFC 3462 (Delivery Status Notifications)\nRFC 3464 (Delivery Status Notifications)\nRFC 3834 (Auto-Submitted: message header)\nRFC 5322 (Internet Message Format)\nRFC 6531 (Internationalized SMTP)\nRFC 6532 (Internationalized Message Format)\nRFC 6533 (Internationalized Delivery Status Notifications)\n", "subsections": [] }, "DIAGNOSTICS": { "content": "Problems and transactions are logged to syslogd(8) or postlogd(8).\n", "subsections": [] }, "CONFIGURATION PARAMETERS": { "content": "Changes to main.cf are picked up automatically, as bounce(8) processes run for only a limited\namount of time. Use the command \"postfix reload\" to speed up a change.\n\nThe text below provides only a parameter summary. See postconf(5) for more details including\nexamples.\n", "subsections": [ { "name": "2bounce_notice_recipient (postmaster)", "content": "The recipient of undeliverable mail that cannot be returned to the sender.\n" }, { "name": "backwards_bounce_logfile_compatibility (yes)", "content": "Produce additional bounce(8) logfile records that can be read by Postfix versions be‐\nfore 2.0.\n" }, { "name": "bounce_notice_recipient (postmaster)", "content": "The recipient of postmaster notifications with the message headers of mail that Post‐\nfix did not deliver and of SMTP conversation transcripts of mail that Postfix did not\nreceive.\n" }, { "name": "bounce_size_limit (50000)", "content": "The maximal amount of original message text that is sent in a non-delivery notifica‐\ntion.\n" }, { "name": "bounce_template_file (empty)", "content": "Pathname of a configuration file with bounce message templates.\n" }, { "name": "config_directory (see 'postconf -d' output)", "content": "The default location of the Postfix main.cf and master.cf configuration files.\n" }, { "name": "daemon_timeout (18000s)", "content": "How much time a Postfix daemon process may take to handle a request before it is ter‐\nminated by a built-in watchdog timer.\n" }, { "name": "delay_notice_recipient (postmaster)", "content": "The recipient of postmaster notifications with the message headers of mail that cannot\nbe delivered within $delaywarningtime time units.\n" }, { "name": "deliver_lock_attempts (20)", "content": "The maximal number of attempts to acquire an exclusive lock on a mailbox file or\nbounce(8) logfile.\n" }, { "name": "deliver_lock_delay (1s)", "content": "The time between attempts to acquire an exclusive lock on a mailbox file or bounce(8)\nlogfile.\n" }, { "name": "ipc_timeout (3600s)", "content": "The time limit for sending or receiving information over an internal communication\nchannel.\n" }, { "name": "internal_mail_filter_classes (empty)", "content": "What categories of Postfix-generated mail are subject to before-queue content inspec‐\ntion by nonsmtpdmilters, headerchecks and bodychecks.\n" }, { "name": "mail_name (Postfix)", "content": "The mail system name that is displayed in Received: headers, in the SMTP greeting ban‐\nner, and in bounced mail.\n" }, { "name": "max_idle (100s)", "content": "The maximum amount of time that an idle Postfix daemon process waits for an incoming\nconnection before terminating voluntarily.\n" }, { "name": "max_use (100)", "content": "The maximal number of incoming connections that a Postfix daemon process will service\nbefore terminating voluntarily.\n" }, { "name": "notify_classes (resource, software)", "content": "The list of error classes that are reported to the postmaster.\n" }, { "name": "process_id (read-only)", "content": "The process ID of a Postfix command or daemon process.\n" }, { "name": "process_name (read-only)", "content": "The process name of a Postfix command or daemon process.\n" }, { "name": "queue_directory (see 'postconf -d' output)", "content": "The location of the Postfix top-level queue directory.\n" }, { "name": "syslog_facility (mail)", "content": "The syslog facility of Postfix logging.\n" }, { "name": "syslog_name (see 'postconf -d' output)", "content": "A prefix that is prepended to the process name in syslog records, so that, for exam‐\nple, \"smtpd\" becomes \"prefix/smtpd\".\n\nAvailable in Postfix 3.0 and later:\n" }, { "name": "smtputf8_autodetect_classes (sendmail, verify)", "content": "Detect that a message requires SMTPUTF8 support for the specified mail origin classes.\n\nAvailable in Postfix 3.3 and later:\n" }, { "name": "service_name (read-only)", "content": "The master.cf service name of a Postfix daemon process.\n\nAvailable in Postfix 3.6 and later:\n" }, { "name": "enable_threaded_bounces (no)", "content": "Enable non-delivery, success, and delay notifications that link to the original mes‐\nsage by including a References: and In-Reply-To: header with the original Message-ID\nvalue.\n\nAvailable in Postfix 3.7 and later:\n" }, { "name": "header_from_format (standard)", "content": "The format of the Postfix-generated From: header.\n" } ] }, "FILES": { "content": "/var/spool/postfix/bounce/* non-delivery records\n/var/spool/postfix/defer/* non-delivery records\n/var/spool/postfix/trace/* delivery status records\n", "subsections": [] }, "SEE ALSO": { "content": "bounce(5), bounce message template format\nqmgr(8), queue manager\npostconf(5), configuration parameters\nmaster(5), generic daemon options\nmaster(8), process manager\npostlogd(8), Postfix logging\nsyslogd(8), system logging\n", "subsections": [] }, "LICENSE": { "content": "The Secure Mailer license must be distributed with this software.\n\nAUTHOR(S)\nWietse Venema\nIBM T.J. Watson Research\nP.O. Box 704\nYorktown Heights, NY 10598, USA\n\nWietse Venema\nGoogle, Inc.\n111 8th Avenue\nNew York, NY 10011, USA\n\nBOUNCE(8postfix)", "subsections": [] } }, "summary": "bounce - Postfix delivery status reports", "flags": [], "examples": [], "see_also": [ { "name": "bounce", "section": "5", "url": "https://www.chedong.com/phpMan.php/man/bounce/5/json" }, { "name": "qmgr", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/qmgr/8/json" }, { "name": "postconf", "section": "5", "url": "https://www.chedong.com/phpMan.php/man/postconf/5/json" }, { "name": "master", "section": "5", "url": "https://www.chedong.com/phpMan.php/man/master/5/json" }, { "name": "master", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/master/8/json" }, { "name": "postlogd", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/postlogd/8/json" }, { "name": "syslogd", "section": "8", "url": "https://www.chedong.com/phpMan.php/man/syslogd/8/json" } ] }