1<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN" 2 "http://www.w3.org/TR/html4/loose.dtd"> 3<html> <head> 4<meta http-equiv="Content-Type" content="text/html; charset=us-ascii"> 5<title> Postfix manual - qmgr(8) </title> 6</head> <body> <pre> 7QMGR(8) QMGR(8) 8 9<b>NAME</b> 10 qmgr - Postfix queue manager 11 12<b>SYNOPSIS</b> 13 <b>qmgr</b> [generic Postfix daemon options] 14 15<b>DESCRIPTION</b> 16 The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon awaits the arrival of incoming mail and arranges for 17 its delivery via Postfix delivery processes. The actual mail routing 18 strategy is delegated to the <a href="trivial-rewrite.8.html"><b>trivial-rewrite</b>(8)</a> daemon. This program 19 expects to be run from the <a href="master.8.html"><b>master</b>(8)</a> process manager. 20 21 Mail addressed to the local <b>double-bounce</b> address is logged and dis- 22 carded. This stops potential loops caused by undeliverable bounce 23 notifications. 24 25<b>MAIL QUEUES</b> 26 The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon maintains the following queues: 27 28 <b>incoming</b> 29 Inbound mail from the network, or mail picked up by the local 30 <a href="pickup.8.html"><b>pickup</b>(8)</a> daemon from the <b>maildrop</b> directory. 31 32 <b>active</b> Messages that the queue manager has opened for delivery. Only a 33 limited number of messages is allowed to enter the <b>active</b> queue 34 (leaky bucket strategy, for a fixed delivery rate). 35 36 <b>deferred</b> 37 Mail that could not be delivered upon the first attempt. The 38 queue manager implements exponential backoff by doubling the 39 time between delivery attempts. 40 41 <b>corrupt</b> 42 Unreadable or damaged queue files are moved here for inspection. 43 44 <b>hold</b> Messages that are kept "on hold" are kept here until someone 45 sets them free. 46 47<b>DELIVERY STATUS REPORTS</b> 48 The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon keeps an eye on per-message delivery status reports 49 in the following directories. Each status report file has the same name 50 as the corresponding message file: 51 52 <b>bounce</b> Per-recipient status information about why mail is bounced. 53 These files are maintained by the <a href="bounce.8.html"><b>bounce</b>(8)</a> daemon. 54 55 <b>defer</b> Per-recipient status information about why mail is delayed. 56 These files are maintained by the <a href="defer.8.html"><b>defer</b>(8)</a> daemon. 57 58 <b>trace</b> Per-recipient status information as requested with the Postfix 59 "<b>sendmail -v</b>" or "<b>sendmail -bv</b>" command. These files are main- 60 tained by the <a href="trace.8.html"><b>trace</b>(8)</a> daemon. 61 62 The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon is responsible for asking the <a href="bounce.8.html"><b>bounce</b>(8)</a>, <a href="defer.8.html"><b>defer</b>(8)</a> or 63 <a href="trace.8.html"><b>trace</b>(8)</a> daemons to send delivery reports. 64 65<b>STRATEGIES</b> 66 The queue manager implements a variety of strategies for either opening 67 queue files (input) or for message delivery (output). 68 69 <b>leaky bucket</b> 70 This strategy limits the number of messages in the <b>active</b> queue 71 and prevents the queue manager from running out of memory under 72 heavy load. 73 74 <b>fairness</b> 75 When the <b>active</b> queue has room, the queue manager takes one mes- 76 sage from the <a href="QSHAPE_README.html#incoming_queue"><b>incoming</b> queue</a> and one from the <b>deferred</b> queue. 77 This prevents a large mail backlog from blocking the delivery of 78 new mail. 79 80 <b>slow start</b> 81 This strategy eliminates "thundering herd" problems by slowly 82 adjusting the number of parallel deliveries to the same destina- 83 tion. 84 85 <b>round robin</b> 86 The queue manager sorts delivery requests by destination. 87 Round-robin selection prevents one destination from dominating 88 deliveries to other destinations. 89 90 <b>exponential backoff</b> 91 Mail that cannot be delivered upon the first attempt is 92 deferred. The time interval between delivery attempts is dou- 93 bled after each attempt. 94 95 <b>destination status cache</b> 96 The queue manager avoids unnecessary delivery attempts by main- 97 taining a short-term, in-memory list of unreachable destina- 98 tions. 99 100 <b>preemptive message scheduling</b> 101 The queue manager attempts to minimize the average per-recipient 102 delay while still preserving the correct per-message delays, 103 using a sophisticated preemptive message scheduling. 104 105<b>TRIGGERS</b> 106 On an idle system, the queue manager waits for the arrival of trigger 107 events, or it waits for a timer to go off. A trigger is a one-byte mes- 108 sage. Depending on the message received, the queue manager performs 109 one of the following actions (the message is followed by the symbolic 110 constant used internally by the software): 111 112 <b>D (QMGR_REQ_SCAN_DEFERRED)</b> 113 Start a <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> scan. If a deferred queue scan is 114 already in progress, that scan will be restarted as soon as it 115 finishes. 116 117 <b>I (QMGR_REQ_SCAN_INCOMING)</b> 118 Start an <a href="QSHAPE_README.html#incoming_queue">incoming queue</a> scan. If an incoming queue scan is 119 already in progress, that scan will be restarted as soon as it 120 finishes. 121 122 <b>A (QMGR_REQ_SCAN_ALL)</b> 123 Ignore <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> file time stamps. The request affects the 124 next <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> scan. 125 126 <b>F (QMGR_REQ_FLUSH_DEAD)</b> 127 Purge all information about dead transports and destinations. 128 129 <b>W (TRIGGER_REQ_WAKEUP)</b> 130 Wakeup call, This is used by the master server to instantiate 131 servers that should not go away forever. The action is to start 132 an <a href="QSHAPE_README.html#incoming_queue">incoming queue</a> scan. 133 134 The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon reads an entire buffer worth of triggers. Multiple 135 identical trigger requests are collapsed into one, and trigger requests 136 are sorted so that <b>A</b> and <b>F</b> precede <b>D</b> and <b>I</b>. Thus, in order to force a 137 <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> run, one would request <b>A F D</b>; in order to notify the 138 queue manager of the arrival of new mail one would request <b>I</b>. 139 140<b>STANDARDS</b> 141 <a href="http://tools.ietf.org/html/rfc3463">RFC 3463</a> (Enhanced status codes) 142 <a href="http://tools.ietf.org/html/rfc3464">RFC 3464</a> (Delivery status notifications) 143 144<b>SECURITY</b> 145 The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon is not security sensitive. It reads single-character 146 messages from untrusted local users, and thus may be susceptible to 147 denial of service attacks. The <a href="qmgr.8.html"><b>qmgr</b>(8)</a> daemon does not talk to the out- 148 side world, and it can be run at fixed low privilege in a chrooted 149 environment. 150 151<b>DIAGNOSTICS</b> 152 Problems and transactions are logged to <b>syslogd</b>(8) or <a href="postlogd.8.html"><b>postlogd</b>(8)</a>. 153 Corrupted message files are saved to the <b>corrupt</b> queue for further 154 inspection. 155 156 Depending on the setting of the <b><a href="postconf.5.html#notify_classes">notify_classes</a></b> parameter, the postmas- 157 ter is notified of bounces and of other trouble. 158 159<b>BUGS</b> 160 A single queue manager process has to compete for disk access with mul- 161 tiple front-end processes such as <a href="cleanup.8.html"><b>cleanup</b>(8)</a>. A sudden burst of inbound 162 mail can negatively impact outbound delivery rates. 163 164<b>CONFIGURATION PARAMETERS</b> 165 Changes to <a href="postconf.5.html"><b>main.cf</b></a> are not picked up automatically as <a href="qmgr.8.html"><b>qmgr</b>(8)</a> is a per- 166 sistent process. Use the "<b>postfix reload</b>" command after a configuration 167 change. 168 169 The text below provides only a parameter summary. See <a href="postconf.5.html"><b>postconf</b>(5)</a> for 170 more details including examples. 171 172 In the text below, <i>transport</i> is the first field in a <a href="master.5.html"><b>master.cf</b></a> entry. 173 174<b>COMPATIBILITY CONTROLS</b> 175 Available before Postfix version 2.5: 176 177 <b><a href="postconf.5.html#allow_min_user">allow_min_user</a> (no)</b> 178 Allow a sender or recipient address to have `-' as the first 179 character. 180 181 Available with Postfix version 2.7 and later: 182 183 <b><a href="postconf.5.html#default_filter_nexthop">default_filter_nexthop</a> (empty)</b> 184 When a <a href="postconf.5.html#content_filter">content_filter</a> or FILTER request specifies no explicit 185 next-hop destination, use $<a href="postconf.5.html#default_filter_nexthop">default_filter_nexthop</a> instead; when 186 that value is empty, use the domain in the recipient address. 187 188<b>ACTIVE QUEUE CONTROLS</b> 189 <b><a href="postconf.5.html#qmgr_clog_warn_time">qmgr_clog_warn_time</a> (300s)</b> 190 The minimal delay between warnings that a specific destination 191 is clogging up the Postfix <a href="QSHAPE_README.html#active_queue">active queue</a>. 192 193 <b><a href="postconf.5.html#qmgr_message_active_limit">qmgr_message_active_limit</a> (20000)</b> 194 The maximal number of messages in the <a href="QSHAPE_README.html#active_queue">active queue</a>. 195 196 <b><a href="postconf.5.html#qmgr_message_recipient_limit">qmgr_message_recipient_limit</a> (20000)</b> 197 The maximal number of recipients held in memory by the Postfix 198 queue manager, and the maximal size of the short-term, in-memory 199 "dead" destination status cache. 200 201 <b><a href="postconf.5.html#qmgr_message_recipient_minimum">qmgr_message_recipient_minimum</a> (10)</b> 202 The minimal number of in-memory recipients for any message. 203 204 <b><a href="postconf.5.html#default_recipient_limit">default_recipient_limit</a> (20000)</b> 205 The default per-transport upper limit on the number of in-memory 206 recipients. 207 208 <b>transport_recipient_limit ($<a href="postconf.5.html#default_recipient_limit">default_recipient_limit</a>)</b> 209 A transport-specific override for the <a href="postconf.5.html#default_recipient_limit">default_recipient_limit</a> 210 parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name of the 211 message delivery transport. 212 213 <b><a href="postconf.5.html#default_extra_recipient_limit">default_extra_recipient_limit</a> (1000)</b> 214 The default value for the extra per-transport limit imposed on 215 the number of in-memory recipients. 216 217 <b>transport_extra_recipient_limit ($<a href="postconf.5.html#default_extra_recipient_limit">default_extra_recipient_limit</a>)</b> 218 A transport-specific override for the <a href="postconf.5.html#default_extra_recipient_limit">default_extra_recipi</a>- 219 <a href="postconf.5.html#default_extra_recipient_limit">ent_limit</a> parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name 220 of the message delivery transport. 221 222 Available in Postfix version 2.4 and later: 223 224 <b><a href="postconf.5.html#default_recipient_refill_limit">default_recipient_refill_limit</a> (100)</b> 225 The default per-transport limit on the number of recipients 226 refilled at once. 227 228 <b>transport_recipient_refill_limit ($<a href="postconf.5.html#default_recipient_refill_limit">default_recipient_refill_limit</a>)</b> 229 A transport-specific override for the <a href="postconf.5.html#default_recipient_refill_limit">default_recipi</a>- 230 <a href="postconf.5.html#default_recipient_refill_limit">ent_refill_limit</a> parameter value, where <i>transport</i> is the <a href="master.5.html">mas- 231 ter.cf</a> name of the message delivery transport. 232 233 <b><a href="postconf.5.html#default_recipient_refill_delay">default_recipient_refill_delay</a> (5s)</b> 234 The default per-transport maximum delay between recipients 235 refills. 236 237 <b>transport_recipient_refill_delay ($<a href="postconf.5.html#default_recipient_refill_delay">default_recipient_refill_delay</a>)</b> 238 A transport-specific override for the <a href="postconf.5.html#default_recipient_refill_delay">default_recipi</a>- 239 <a href="postconf.5.html#default_recipient_refill_delay">ent_refill_delay</a> parameter value, where <i>transport</i> is the <a href="master.5.html">mas- 240 ter.cf</a> name of the message delivery transport. 241 242<b>DELIVERY CONCURRENCY CONTROLS</b> 243 <b><a href="postconf.5.html#initial_destination_concurrency">initial_destination_concurrency</a> (5)</b> 244 The initial per-destination concurrency level for parallel 245 delivery to the same destination. 246 247 <b><a href="postconf.5.html#default_destination_concurrency_limit">default_destination_concurrency_limit</a> (20)</b> 248 The default maximal number of parallel deliveries to the same 249 destination. 250 251 <b>transport_destination_concurrency_limit ($<a href="postconf.5.html#default_destination_concurrency_limit">default_destination_concur</a>-</b> 252 <b><a href="postconf.5.html#default_destination_concurrency_limit">rency_limit</a>)</b> 253 A transport-specific override for the default_destination_con- 254 currency_limit parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> 255 name of the message delivery transport. 256 257 Available in Postfix version 2.5 and later: 258 259 <b>transport_initial_destination_concurrency ($<a href="postconf.5.html#initial_destination_concurrency">initial_destination_concur</a>-</b> 260 <b><a href="postconf.5.html#initial_destination_concurrency">rency</a>)</b> 261 A transport-specific override for the initial_destination_con- 262 currency parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name 263 of the message delivery transport. 264 265 <b><a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">default_destination_concurrency_failed_cohort_limit</a> (1)</b> 266 How many pseudo-cohorts must suffer connection or handshake 267 failure before a specific destination is considered unavailable 268 (and further delivery is suspended). 269 270 <b>transport_destination_concurrency_failed_cohort_limit ($<a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">default_desti</a>-</b> 271 <b><a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">nation_concurrency_failed_cohort_limit</a>)</b> 272 A transport-specific override for the <a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">default_destination_con</a>- 273 <a href="postconf.5.html#default_destination_concurrency_failed_cohort_limit">currency_failed_cohort_limit</a> parameter value, where <i>transport</i> is 274 the <a href="master.5.html">master.cf</a> name of the message delivery transport. 275 276 <b><a href="postconf.5.html#default_destination_concurrency_negative_feedback">default_destination_concurrency_negative_feedback</a> (1)</b> 277 The per-destination amount of delivery concurrency negative 278 feedback, after a delivery completes with a connection or hand- 279 shake failure. 280 281 <b>transport_destination_concurrency_negative_feedback ($<a href="postconf.5.html#default_destination_concurrency_negative_feedback">default_destina</a>-</b> 282 <b><a href="postconf.5.html#default_destination_concurrency_negative_feedback">tion_concurrency_negative_feedback</a>)</b> 283 A transport-specific override for the default_destination_con- 284 currency_negative_feedback parameter value, where <i>transport</i> is 285 the <a href="master.5.html">master.cf</a> name of the message delivery transport. 286 287 <b><a href="postconf.5.html#default_destination_concurrency_positive_feedback">default_destination_concurrency_positive_feedback</a> (1)</b> 288 The per-destination amount of delivery concurrency positive 289 feedback, after a delivery completes without connection or hand- 290 shake failure. 291 292 <b>transport_destination_concurrency_positive_feedback ($<a href="postconf.5.html#default_destination_concurrency_positive_feedback">default_destina</a>-</b> 293 <b><a href="postconf.5.html#default_destination_concurrency_positive_feedback">tion_concurrency_positive_feedback</a>)</b> 294 A transport-specific override for the default_destination_con- 295 currency_positive_feedback parameter value, where <i>transport</i> is 296 the <a href="master.5.html">master.cf</a> name of the message delivery transport. 297 298 <b><a href="postconf.5.html#destination_concurrency_feedback_debug">destination_concurrency_feedback_debug</a> (no)</b> 299 Make the queue manager's feedback algorithm verbose for perfor- 300 mance analysis purposes. 301 302<b>RECIPIENT SCHEDULING CONTROLS</b> 303 <b><a href="postconf.5.html#default_destination_recipient_limit">default_destination_recipient_limit</a> (50)</b> 304 The default maximal number of recipients per message delivery. 305 306 <b>transport_destination_recipient_limit ($<a href="postconf.5.html#default_destination_recipient_limit">default_destination_recipi</a>-</b> 307 <b><a href="postconf.5.html#default_destination_recipient_limit">ent_limit</a>)</b> 308 A transport-specific override for the <a href="postconf.5.html#default_destination_recipient_limit">default_destination_recip</a>- 309 <a href="postconf.5.html#default_destination_recipient_limit">ient_limit</a> parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> 310 name of the message delivery transport. 311 312<b>MESSAGE SCHEDULING CONTROLS</b> 313 <b><a href="postconf.5.html#default_delivery_slot_cost">default_delivery_slot_cost</a> (5)</b> 314 How often the Postfix queue manager's scheduler is allowed to 315 preempt delivery of one message with another. 316 317 <b>transport_delivery_slot_cost ($<a href="postconf.5.html#default_delivery_slot_cost">default_delivery_slot_cost</a>)</b> 318 A transport-specific override for the <a href="postconf.5.html#default_delivery_slot_cost">default_delivery_slot_cost</a> 319 parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name of the 320 message delivery transport. 321 322 <b><a href="postconf.5.html#default_minimum_delivery_slots">default_minimum_delivery_slots</a> (3)</b> 323 How many recipients a message must have in order to invoke the 324 Postfix queue manager's scheduling algorithm at all. 325 326 <b>transport_minimum_delivery_slots ($<a href="postconf.5.html#default_minimum_delivery_slots">default_minimum_delivery_slots</a>)</b> 327 A transport-specific override for the <a href="postconf.5.html#default_minimum_delivery_slots">default_minimum_deliv</a>- 328 <a href="postconf.5.html#default_minimum_delivery_slots">ery_slots</a> parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name 329 of the message delivery transport. 330 331 <b><a href="postconf.5.html#default_delivery_slot_discount">default_delivery_slot_discount</a> (50)</b> 332 The default value for transport-specific _delivery_slot_discount 333 settings. 334 335 <b>transport_delivery_slot_discount ($<a href="postconf.5.html#default_delivery_slot_discount">default_delivery_slot_discount</a>)</b> 336 A transport-specific override for the default_delivery_slot_dis- 337 count parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name of 338 the message delivery transport. 339 340 <b><a href="postconf.5.html#default_delivery_slot_loan">default_delivery_slot_loan</a> (3)</b> 341 The default value for transport-specific _delivery_slot_loan 342 settings. 343 344 <b>transport_delivery_slot_loan ($<a href="postconf.5.html#default_delivery_slot_loan">default_delivery_slot_loan</a>)</b> 345 A transport-specific override for the <a href="postconf.5.html#default_delivery_slot_loan">default_delivery_slot_loan</a> 346 parameter value, where <i>transport</i> is the <a href="master.5.html">master.cf</a> name of the 347 message delivery transport. 348 349<b>OTHER RESOURCE AND RATE CONTROLS</b> 350 <b><a href="postconf.5.html#minimal_backoff_time">minimal_backoff_time</a> (300s)</b> 351 The minimal time between attempts to deliver a deferred message; 352 prior to Postfix 2.4 the default value was 1000s. 353 354 <b><a href="postconf.5.html#maximal_backoff_time">maximal_backoff_time</a> (4000s)</b> 355 The maximal time between attempts to deliver a deferred message. 356 357 <b><a href="postconf.5.html#maximal_queue_lifetime">maximal_queue_lifetime</a> (5d)</b> 358 Consider a message as undeliverable, when delivery fails with a 359 temporary error, and the time in the queue has reached the <a href="postconf.5.html#maximal_queue_lifetime">maxi</a>- 360 <a href="postconf.5.html#maximal_queue_lifetime">mal_queue_lifetime</a> limit. 361 362 <b><a href="postconf.5.html#queue_run_delay">queue_run_delay</a> (300s)</b> 363 The time between <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> scans by the queue manager; 364 prior to Postfix 2.4 the default value was 1000s. 365 366 <b><a href="postconf.5.html#transport_retry_time">transport_retry_time</a> (60s)</b> 367 The time between attempts by the Postfix queue manager to con- 368 tact a malfunctioning message delivery transport. 369 370 Available in Postfix version 2.1 and later: 371 372 <b><a href="postconf.5.html#bounce_queue_lifetime">bounce_queue_lifetime</a> (5d)</b> 373 Consider a bounce message as undeliverable, when delivery fails 374 with a temporary error, and the time in the queue has reached 375 the <a href="postconf.5.html#bounce_queue_lifetime">bounce_queue_lifetime</a> limit. 376 377 Available in Postfix version 2.5 and later: 378 379 <b><a href="postconf.5.html#default_destination_rate_delay">default_destination_rate_delay</a> (0s)</b> 380 The default amount of delay that is inserted between individual 381 message deliveries to the same destination and over the same 382 message delivery transport. 383 384 <b>transport_destination_rate_delay ($<a href="postconf.5.html#default_destination_rate_delay">default_destination_rate_delay</a>)</b> 385 A transport-specific override for the <a href="postconf.5.html#default_destination_rate_delay">default_destina</a>- 386 <a href="postconf.5.html#default_destination_rate_delay">tion_rate_delay</a> parameter value, where <i>transport</i> is the <a href="master.5.html">mas- 387 ter.cf</a> name of the message delivery transport. 388 389 Available in Postfix version 3.1 and later: 390 391 <b><a href="postconf.5.html#default_transport_rate_delay">default_transport_rate_delay</a> (0s)</b> 392 The default amount of delay that is inserted between individual 393 message deliveries over the same message delivery transport, 394 regardless of destination. 395 396 <b>transport_transport_rate_delay ($<a href="postconf.5.html#default_transport_rate_delay">default_transport_rate_delay</a>)</b> 397 A transport-specific override for the <a href="postconf.5.html#default_transport_rate_delay">default_trans</a>- 398 <a href="postconf.5.html#default_transport_rate_delay">port_rate_delay</a> parameter value, where the initial <i>transport</i> in 399 the parameter name is the <a href="master.5.html">master.cf</a> name of the message delivery 400 transport. 401 402<b>SAFETY CONTROLS</b> 403 <b><a href="postconf.5.html#qmgr_daemon_timeout">qmgr_daemon_timeout</a> (1000s)</b> 404 How much time a Postfix queue manager process may take to handle 405 a request before it is terminated by a built-in watchdog timer. 406 407 <b><a href="postconf.5.html#qmgr_ipc_timeout">qmgr_ipc_timeout</a> (60s)</b> 408 The time limit for the queue manager to send or receive informa- 409 tion over an internal communication channel. 410 411 Available in Postfix version 3.1 and later: 412 413 <b><a href="postconf.5.html#address_verify_pending_request_limit">address_verify_pending_request_limit</a> (see 'postconf -d' output)</b> 414 A safety limit that prevents address verification requests from 415 overwhelming the Postfix queue. 416 417<b>MISCELLANEOUS CONTROLS</b> 418 <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b> 419 The default location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con- 420 figuration files. 421 422 <b><a href="postconf.5.html#defer_transports">defer_transports</a> (empty)</b> 423 The names of message delivery transports that should not deliver 424 mail unless someone issues "<b>sendmail -q</b>" or equivalent. 425 426 <b><a href="postconf.5.html#delay_logging_resolution_limit">delay_logging_resolution_limit</a> (2)</b> 427 The maximal number of digits after the decimal point when log- 428 ging sub-second delay values. 429 430 <b><a href="postconf.5.html#helpful_warnings">helpful_warnings</a> (yes)</b> 431 Log warnings about problematic configuration settings, and pro- 432 vide helpful suggestions. 433 434 <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b> 435 The process ID of a Postfix command or daemon process. 436 437 <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b> 438 The process name of a Postfix command or daemon process. 439 440 <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b> 441 The location of the Postfix top-level queue directory. 442 443 <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b> 444 The syslog facility of Postfix logging. 445 446 <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b> 447 A prefix that is prepended to the process name in syslog 448 records, so that, for example, "smtpd" becomes "prefix/smtpd". 449 450 Available in Postfix version 3.0 and later: 451 452 <b><a href="postconf.5.html#confirm_delay_cleared">confirm_delay_cleared</a> (no)</b> 453 After sending a "your message is delayed" notification, inform 454 the sender when the delay clears up. 455 456 Available in Postfix 3.3 and later: 457 458 <b><a href="postconf.5.html#service_name">service_name</a> (read-only)</b> 459 The <a href="master.5.html">master.cf</a> service name of a Postfix daemon process. 460 461 Available in Postfix 3.5 and later: 462 463 <b>info_log_address_format (external)</b> 464 The email address form that will be used in non-debug logging 465 (info, warning, etc.). 466 467<b>FILES</b> 468 /var/spool/postfix/incoming, <a href="QSHAPE_README.html#incoming_queue">incoming queue</a> 469 /var/spool/postfix/active, <a href="QSHAPE_README.html#active_queue">active queue</a> 470 /var/spool/postfix/deferred, <a href="QSHAPE_README.html#deferred_queue">deferred queue</a> 471 /var/spool/postfix/bounce, non-delivery status 472 /var/spool/postfix/defer, non-delivery status 473 /var/spool/postfix/trace, delivery status 474 475<b>SEE ALSO</b> 476 <a href="trivial-rewrite.8.html">trivial-rewrite(8)</a>, address routing 477 <a href="bounce.8.html">bounce(8)</a>, delivery status reports 478 <a href="postconf.5.html">postconf(5)</a>, configuration parameters 479 <a href="master.5.html">master(5)</a>, generic daemon options 480 <a href="master.8.html">master(8)</a>, process manager 481 <a href="postlogd.8.html">postlogd(8)</a>, Postfix logging 482 syslogd(8), system logging 483 484<b>README FILES</b> 485 <a href="SCHEDULER_README.html">SCHEDULER_README</a>, scheduling algorithm 486 <a href="QSHAPE_README.html">QSHAPE_README</a>, Postfix queue analysis 487 488<b>LICENSE</b> 489 The Secure Mailer license must be distributed with this software. 490 491<b>AUTHOR(S)</b> 492 Wietse Venema 493 IBM T.J. Watson Research 494 P.O. Box 704 495 Yorktown Heights, NY 10598, USA 496 497 Preemptive scheduler enhancements: 498 Patrik Rak 499 Modra 6 500 155 00, Prague, Czech Republic 501 502 Wietse Venema 503 Google, Inc. 504 111 8th Avenue 505 New York, NY 10011, USA 506 507 QMGR(8) 508</pre> </body> </html> 509