Postfix Overview - Introduction - SCN Research

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This parameter also limits the size of the shortterm, in-memory destination cache. Page 4 of 5 Timing controls min_backoff Minimal time in seconds between delivery attempts of a deferred message. This parameter also limits the time an unreachable destination is kept in the short-term, in-memory destination status cache. max_backoff Maximal time in seconds between delivery attempts of a deferred message. maximal_queue_lifetime Maximal time in days a message is queued before it is sent back as undeliverable. queue_run_delay Time in seconds between deferred queue scans. Queue scans do not overlap. transport_retry_time Time in seconds between attempts to contact a broken delivery transport. Concurrency controls In the text below, transport is the first field in a master.cf entry. qmgr_fudge_factor (valid range: 10..100) The percentage of delivery resources that a busy mail system will use up for delivery of a large mailing list message. With 100%, delivery of one message does not begin before the previous message has been delivered. This results in good performance for large mailing lists, but results in poor response time for one-to-one mail. With less than 100%, response time for one-to-one mail improves, but large mailing list delivery performance suffers. In the worst case, recipients near the beginning of a large list receive a burst of messages immediately, while recipients near the end of that list receive that same burst of messages a whole day later. qmgr_site_hog_factor (valid range: 10..100) The percentage of delivery resources that a busy mail system will use up for delivery to a single site. With 100%, mail is delivered in first-in, first-out order, so that a burst of mail for one site can block mail for other destinations. With less than 100%, the excess mail is deferred. The deferred mail is delivered in little bursts, the remainder of the backlog being deferred again, with a lot of I/O activity happening as <strong>Postfix</strong> searches the deferred queue for deliverable mail. initial_destination_concurrency Initial per-destination concurrency level for parallel delivery to the same destination. http://www.porcupine.org/postfix-mirror/qmgr.8.html 6/26/01
Page 5 of 5 default_destination_concurrency_limit Default limit on the number of parallel deliveries to the same destination. transport_destination_concurrency_limit Limit on the number of parallel deliveries to the same destination, for delivery via the named message transport. Recipient controls default_destination_recipient_limit Default limit on the number of recipients per message transfer. transport_destination_recipient_limit Limit on the number of recipients per message transfer, for the named message transport. SEE ALSO master(8), process manager relocated(5), format of the "user has moved" table syslogd(8) system logging trivial-rewrite(8), address routing LICENSE The Secure Mailer license must be distributed with this software. AUTHOR(S) Wietse Venema IBM T.J. Watson <strong>Research</strong> P.O. Box 704 Yorktown Heights, NY 10598, USA 1 http://www.porcupine.org/postfix-mirror/qmgr.8.html 6/26/01
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Postfix Overview - Introduction Pag
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Postfix Overview - Goals and Featur
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Postfix Overview - Global Architect
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Postfix Overview - Queue Management
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Postfix Overview - Security assista
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Postfix Anatomy - Receiving Mail Pa
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Postfix Anatomy - Delivering Mail p
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Postfix Anatomy - Command-line Util
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Postfix Configuration - Basics What
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Postfix Configuration - Basics My o
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Postfix Configuration - UCE Control
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Postfix Rate Controls Page 1 of 4 P
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Postfix Rate Controls The defer_tra
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Postfix Configuration - Resource Co
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Postfix Configuration - Resource Co
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Postfix Configuration - Address Man
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Postfix Configuration - Address Man
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ACCESS(5) ACCESS(5) Page 1 of 3 NAM
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1 Page 3 of 3 http://www.porcupine.
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ited to regular files. For example,
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BOUNCE(8) BOUNCE(8) Page 1 of 2 NAM
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CANONICAL(5) CANONICAL(5) Page 1 of
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canonical_maps List of canonical ma
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CONFIGURATION PARAMETERS The follow
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BOUNCE(8) BOUNCE(8) Page 1 of 2 NAM
Page 64 and 65: FLUSH(8) FLUSH(8) Page 1 of 3 NAME
Page 66 and 67: fast_flush_purge_time Remove an emp
Page 68 and 69: Problems and transactions are logge
Page 70 and 71: parameter. Page 4 of 5 Timeout cont
Page 72 and 73: LOCAL(8) LOCAL(8) Page 1 of 7 NAME
Page 74 and 75: estricts delivery to external comma
Page 76 and 77: details and for default values. Use
Page 78 and 79: that is written to upon delivery).
Page 80 and 81: Page 2 of 3 SIGTERM Upon receipt of
Page 82 and 83: PCRE_TABLE(5) PCRE_TABLE(5) Page 1
Page 84 and 85: PICKUP(8) PICKUP(8) Page 1 of 2 NAM
Page 86 and 87: PIPE(8) PIPE(8) Page 1 of 5 NAME pi
Page 88 and 89: This macro expands to the extension
Page 90 and 91: ounce(8) non-delivery status report
Page 92 and 93: -r When updating a table, do not wa
Page 94 and 95: POSTCAT(1) POSTCAT(1) Page 1 of 1 N
Page 96 and 97: POSTDROP(1) POSTDROP(1) Page 1 of 2
Page 98 and 99: POSTFIX(1) POSTFIX(1) Page 1 of 2 N
Page 100 and 101: POSTKICK(1) POSTKICK(1) Page 1 of 2
Page 102 and 103: POSTLOCK(1) POSTLOCK(1) Page 1 of 2
Page 104 and 105: POSTLOG(1) POSTLOG(1) Page 1 of 1 N
Page 106 and 107: default, postmap creates a new data
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Page 110 and 111: LICENSE The Secure Mailer license m
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Page 116 and 117: REGEXP_TABLE(5) REGEXP_TABLE(5) Pag
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Page 120 and 121: Yorktown Heights, NY 10598, USA Pag
Page 122 and 123: Page 2 of 5 -C config_file (ignored
Page 124 and 125: Page 4 of 5 DIAGNOSTICS Problems ar
Page 126 and 127: SHOWQ(8) SHOWQ(8) Page 1 of 1 NAME
Page 128 and 129: command after a configuration chang
Page 130 and 131: Page 4 of 4 smtp_helo_timeout Timeo
Page 132 and 133: Support older Microsoft clients tha
Page 134 and 135: Page 4 of 5 smtpd_hard_error_limit
Page 136 and 137: SPAWN(8) SPAWN(8) Page 1 of 2 NAME
Page 138 and 139: TRANSPORT(5) TRANSPORT(5) Page 1 of
Page 140 and 141: the entire domain being looked up.
Page 142 and 143: details and for default values. Use
Page 144 and 145: VIRTUAL(5) VIRTUAL(5) Page 1 of 4 N
Page 146 and 147: site is equal to $myorigin, when si
Page 148 and 149: VIRTUAL(8) VIRTUAL(8) Page 1 of 4 N
Page 150 and 151: Specifies a minimum uid that will b
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Postfix Overview - Introduction - SCN Research

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