1DISCARD(8)                  System Manager's Manual                 DISCARD(8)
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NAME

6       discard - Postfix discard mail delivery agent
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SYNOPSIS

9       discard [generic Postfix daemon options]
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DESCRIPTION

12       The  Postfix discard(8) delivery agent processes delivery requests from
13       the queue manager. Each  request  specifies  a  queue  file,  a  sender
14       address,  a next-hop destination that is treated as the reason for dis‐
15       carding the mail, and recipient information.  The reason  may  be  pre‐
16       fixed with an RFC 3463-compatible detail code.  This program expects to
17       be run from the master(8) process manager.
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19       The discard(8) delivery agent pretends to deliver all recipients in the
20       delivery  request,  logs  the  "next-hop" destination as the reason for
21       discarding the mail, updates the queue file, and either  marks  recipi‐
22       ents  as  finished or informs the queue manager that delivery should be
23       tried again at a later time.
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25       Delivery status reports are sent to the trace(8) daemon as appropriate.
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SECURITY

28       The discard(8) mailer is not security-sensitive. It does  not  talk  to
29       the network, and can be run chrooted at fixed low privilege.
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STANDARDS

32       RFC 3463 (Enhanced Status Codes)
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DIAGNOSTICS

35       Problems and transactions are logged to syslogd(8).
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37       Depending  on the setting of the notify_classes parameter, the postmas‐
38       ter is notified of bounces and of other trouble.
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CONFIGURATION PARAMETERS

41       Changes to main.cf are picked up automatically as discard(8)  processes
42       run for only a limited amount of time. Use the command "postfix reload"
43       to speed up a change.
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45       The text below provides only a parameter summary. See  postconf(5)  for
46       more details including examples.
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48       config_directory (see 'postconf -d' output)
49              The  default  location of the Postfix main.cf and master.cf con‐
50              figuration files.
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52       daemon_timeout (18000s)
53              How much time a Postfix daemon process  may  take  to  handle  a
54              request before it is terminated by a built-in watchdog timer.
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56       delay_logging_resolution_limit (2)
57              The  maximal  number of digits after the decimal point when log‐
58              ging sub-second delay values.
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60       double_bounce_sender (double-bounce)
61              The sender address of postmaster notifications that  are  gener‐
62              ated by the mail system.
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64       ipc_timeout (3600s)
65              The  time  limit  for  sending  or receiving information over an
66              internal communication channel.
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68       max_idle (100s)
69              The maximum amount of time that an idle Postfix  daemon  process
70              waits for an incoming connection before terminating voluntarily.
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72       max_use (100)
73              The maximal number of incoming connections that a Postfix daemon
74              process will service before terminating voluntarily.
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76       process_id (read-only)
77              The process ID of a Postfix command or daemon process.
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79       process_name (read-only)
80              The process name of a Postfix command or daemon process.
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82       queue_directory (see 'postconf -d' output)
83              The location of the Postfix top-level queue directory.
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85       syslog_facility (mail)
86              The syslog facility of Postfix logging.
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88       syslog_name (see 'postconf -d' output)
89              A prefix that  is  prepended  to  the  process  name  in  syslog
90              records, so that, for example, "smtpd" becomes "prefix/smtpd".
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92       Available in Postfix 3.3 and later:
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94       service_name (read-only)
95              The master.cf service name of a Postfix daemon process.
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SEE ALSO

98       qmgr(8), queue manager
99       bounce(8), delivery status reports
100       error(8), Postfix error delivery agent
101       postconf(5), configuration parameters
102       master(5), generic daemon options
103       master(8), process manager
104       syslogd(8), system logging
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LICENSE

107       The Secure Mailer license must be distributed with this software.
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HISTORY

110       This service was introduced with Postfix version 2.2.
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AUTHOR(S)

113       Victor Duchovni
114       Morgan Stanley
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116       Based on code by:
117       Wietse Venema
118       IBM T.J. Watson Research
119       P.O. Box 704
120       Yorktown Heights, NY 10598, USA
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122       Wietse Venema
123       Google, Inc.
124       111 8th Avenue
125       New York, NY 10011, USA
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