DNSBLOG(8)                                                          DNSBLOG(8)

       dnsblog - Postfix DNS white/blacklist logger

       dnsblog [generic Postfix daemon options]

       The  dnsblog(8)  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 postscreen(8) server.

       With each connection, the dnsblog(8) 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 dnsblog(8) 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  dns-
       blog(8) server closes the connection.

       Problems and transactions are logged to syslogd(8).

       Changes to main.cf are picked up automatically, as dnsblog(8) processes
       run for only a limited amount of time. Use the command "postfix reload"
       to speed up a change.

       The  text  below provides only a parameter summary. See postconf(5) for
       more details including examples.

       config_directory (see 'postconf -d' output)
              The default location of the Postfix main.cf and  master.cf  con-
              figuration files.

       daemon_timeout (18000s)
              How  much  time  a  Postfix  daemon process may take to handle a
              request before it is terminated by a built-in watchdog timer.

       postscreen_dnsbl_sites (empty)
              Optional list of DNS white/blacklist domains, filters and weight

       ipc_timeout (3600s)
              The  time  limit  for  sending  or receiving information over an
              internal communication channel.

       process_id (read-only)
              The process ID of a Postfix command or daemon process.

       process_name (read-only)
              The process name of a Postfix command or daemon process.

       queue_directory (see 'postconf -d' output)
              The location of the Postfix top-level queue directory.

       syslog_facility (mail)
              The syslog facility of Postfix logging.

       syslog_name (see 'postconf -d' output)
              The mail system name that is prepended to the  process  name  in
              syslog  records,  so  that  "smtpd" becomes, for example, "post-

       smtpd(8), Postfix SMTP server
       postconf(5), configuration parameters
       syslogd(5), system logging

       The Secure Mailer license must be distributed with this software.

       This service was introduced with Postfix version 2.8.

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA