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<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN"
        "http://www.w3.org/TR/html4/loose.dtd">
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<title> Postfix manual - dnsblog(8) </title>
</head> <body> <pre>
DNSBLOG(8)                                                          DNSBLOG(8)

<b>NAME</b>
       dnsblog - Postfix DNS white/blacklist logger

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

<b>DESCRIPTION</b>
       The  <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a>  server implements an ad-hoc DNS white/blacklist lookup
       service. This may eventually be replaced by an UDP client that is built
       directly into the <a href="postscreen.8.html"><b>postscreen</b>(8)</a> server.

<b>PROTOCOL</b>
       With each connection, the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server receives a DNS white/black-
       list domain name, IP address, and an ID.   If  the  address  is  listed
       under the DNS white/blacklist, the <a href="dnsblog.8.html"><b>dnsblog</b>(8)</a> server logs the match and
       replies with the query arguments plus an address list with the  result-
       ing  IP  addresses  separated by whitespace.  Otherwise it replies with
       the query arguments plus an empty  address  list.   Finally,  The  <a href="dnsblog.8.html"><b>dns-</b></a>
       <a href="dnsblog.8.html"><b>blog</b>(8)</a> server closes the connection.

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

<b>CONFIGURATION PARAMETERS</b>
       Changes to <a href="postconf.5.html"><b>main.cf</b></a> are picked up automatically, as <a href="dnsblog.8.html"><b>dnsblog</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#postscreen_dnsbl_sites">postscreen_dnsbl_sites</a> (empty)</b>
              Optional list of DNS white/blacklist domains, filters and weight
              factors.

       <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#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>SEE ALSO</b>
       <a href="smtpd.8.html">smtpd(8)</a>, Postfix SMTP server
       <a href="postconf.5.html">postconf(5)</a>, configuration parameters
       syslogd(5), system logging

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

<b>HISTORY</b>
       This service was introduced with Postfix version 2.8.

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

                                                                    DNSBLOG(8)
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