This file is indexed.

/usr/share/doc/postfix/html/flush.8.html is in postfix-doc 2.11.0-1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
<html> <head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<title> Postfix manual - flush(8) </title>
</head> <body> <pre>
FLUSH(8)                                                              FLUSH(8)

<b>NAME</b>
       flush - Postfix fast flush server

<b>SYNOPSIS</b>
       <b>flush</b> [generic Postfix daemon options]

<b>DESCRIPTION</b>
       The <a href="flush.8.html"><b>flush</b>(8)</a> server maintains a record of deferred mail by destination.
       This information is used to improve the performance of  the  SMTP  <b>ETRN</b>
       request,   and  of  its  command-line  equivalent,  "<b>sendmail  -qR</b>"  or
       "<b>postqueue -f</b>".  This program expects to  be  run  from  the  <a href="master.8.html"><b>master</b>(8)</a>
       process manager.

       The record is implemented as a per-destination logfile with as contents
       the queue IDs of deferred mail. A logfile is append-only, and is  trun-
       cated  when  delivery is requested for the corresponding destination. A
       destination is the part on the right-hand side of the right-most  <b>@</b>  in
       an email address.

       Per-destination  logfiles of deferred mail are maintained only for eli-
       gible destinations. The list of eligible destinations is specified with
       the  <b><a href="postconf.5.html#fast_flush_domains">fast_flush_domains</a></b>  configuration  parameter,  which  defaults  to
       <b>$<a href="postconf.5.html#relay_domains">relay_domains</a></b>.

       This server implements the following requests:

       <b>add</b> <i>sitename queueid</i>
              Inform the <a href="flush.8.html"><b>flush</b>(8)</a> server that the message with  the  specified
              queue ID is queued for the specified destination.

       <b>send_site</b> <i>sitename</i>
              Request delivery of mail that is queued for the specified desti-
              nation.

       <b>send_file</b> <i>queueid</i>
              Request delivery of the specified deferred message.

       <b>refresh</b>
              Refresh non-empty per-destination logfiles that were not read in
              <b>$<a href="postconf.5.html#fast_flush_refresh_time">fast_flush_refresh_time</a></b> hours, by simulating send requests (see
              above) for the corresponding destinations.

              Delete empty per-destination logfiles that were not  updated  in
              <b>$<a href="postconf.5.html#fast_flush_purge_time">fast_flush_purge_time</a></b> days.

              This request completes in the background.

       <b>purge</b>  Do a <b>refresh</b> for all per-destination logfiles.

<b>SECURITY</b>
       The  <a href="flush.8.html"><b>flush</b>(8)</a> server is not security-sensitive. It does not talk to the
       network, and it does not talk to local users.  The  fast  flush  server
       can run chrooted at fixed low privilege.

<b>DIAGNOSTICS</b>
       Problems and transactions are logged to <b>syslogd</b>(8).

<b>BUGS</b>
       Fast flush logfiles are truncated only after a "send" request, not when
       mail is actually delivered, and therefore can  accumulate  outdated  or
       redundant data. In order to maintain sanity, "refresh" must be executed
       periodically. This can be automated with a suitable wakeup  timer  set-
       ting in the <a href="master.5.html"><b>master.cf</b></a> configuration file.

       Upon  receipt of a request to deliver mail for an eligible destination,
       the <a href="flush.8.html"><b>flush</b>(8)</a> server requests delivery of all messages that  are  listed
       in  that  destination's  logfile, regardless of the recipients of those
       messages. This is not an issue for mail that is sent to a <b><a href="postconf.5.html#relay_domains">relay_domains</a></b>
       destination  because  such  mail  typically  only has recipients in one
       domain.

<b>CONFIGURATION PARAMETERS</b>
       Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically  as  <a href="flush.8.html"><b>flush</b>(8)</a>  processes
       run for only a limited amount of time. Use the command "<b>postfix reload</b>"
       to speed up a change.

       The text below provides only a parameter summary. See  <a href="postconf.5.html"><b>postconf</b>(5)</a>  for
       more details including examples.

       <b><a href="postconf.5.html#config_directory">config_directory</a> (see 'postconf -d' output)</b>
              The  default  location of the Postfix <a href="postconf.5.html">main.cf</a> and <a href="master.5.html">master.cf</a> con-
              figuration files.

       <b><a href="postconf.5.html#daemon_timeout">daemon_timeout</a> (18000s)</b>
              How much time a Postfix daemon process  may  take  to  handle  a
              request before it is terminated by a built-in watchdog timer.

       <b><a href="postconf.5.html#fast_flush_domains">fast_flush_domains</a> ($<a href="postconf.5.html#relay_domains">relay_domains</a>)</b>
              Optional list of destinations that are eligible for per-destina-
              tion logfiles with mail that is queued to those destinations.

       <b><a href="postconf.5.html#fast_flush_refresh_time">fast_flush_refresh_time</a> (12h)</b>
              The time after which  a  non-empty  but  unread  per-destination
              "fast flush" logfile needs to be refreshed.

       <b><a href="postconf.5.html#fast_flush_purge_time">fast_flush_purge_time</a> (7d)</b>
              The  time after which an empty per-destination "fast flush" log-
              file is deleted.

       <b><a href="postconf.5.html#ipc_timeout">ipc_timeout</a> (3600s)</b>
              The time limit for sending  or  receiving  information  over  an
              internal communication channel.

       <b><a href="postconf.5.html#max_idle">max_idle</a> (100s)</b>
              The  maximum  amount of time that an idle Postfix daemon process
              waits for an incoming connection before terminating voluntarily.

       <b><a href="postconf.5.html#max_use">max_use</a> (100)</b>
              The maximal number of incoming connections that a Postfix daemon
              process will service before terminating voluntarily.

       <b><a href="postconf.5.html#parent_domain_matches_subdomains">parent_domain_matches_subdomains</a> (see 'postconf -d' output)</b>
              What Postfix features match subdomains of "domain.tld" automati-
              cally, instead of requiring an explicit ".domain.tld" pattern.

       <b><a href="postconf.5.html#process_id">process_id</a> (read-only)</b>
              The process ID of a Postfix command or daemon process.

       <b><a href="postconf.5.html#process_name">process_name</a> (read-only)</b>
              The process name of a Postfix command or daemon process.

       <b><a href="postconf.5.html#queue_directory">queue_directory</a> (see 'postconf -d' output)</b>
              The location of the Postfix top-level queue directory.

       <b><a href="postconf.5.html#syslog_facility">syslog_facility</a> (mail)</b>
              The syslog facility of Postfix logging.

       <b><a href="postconf.5.html#syslog_name">syslog_name</a> (see 'postconf -d' output)</b>
              The  mail  system  name that is prepended to the process name in
              syslog records, so that "smtpd"  becomes,  for  example,  "post-
              fix/smtpd".

<b>FILES</b>
       /var/spool/postfix/flush, "fast flush" logfiles.

<b>SEE ALSO</b>
       <a href="smtpd.8.html">smtpd(8)</a>, SMTP server
       <a href="qmgr.8.html">qmgr(8)</a>, queue manager
       <a href="postconf.5.html">postconf(5)</a>, configuration parameters
       <a href="master.5.html">master(5)</a>, generic daemon options
       <a href="master.8.html">master(8)</a>, process manager
       syslogd(8), system logging

<b>README FILES</b>
       <a href="ETRN_README.html">ETRN_README</a>, Postfix ETRN howto

<b>LICENSE</b>
       The Secure Mailer license must be distributed with this software.

<b>HISTORY</b>
       This service was introduced with Postfix version 1.0.

<b>AUTHOR(S)</b>
       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA

                                                                      FLUSH(8)
</pre> </body> </html>