    DNSBLOG(8)                                                          DNSBLOG(8)

    NAME
           dnsblog - Postfix DNS white/blacklist logger

    SYNOPSIS
           dnsblog [generic Postfix daemon options]

    DESCRIPTION
           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.

    PROTOCOL
           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.

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8).

    CONFIGURATION PARAMETERS
           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
                  factors.

           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-
                  fix/smtpd".

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

    LICENSE
           The Secure Mailer license must be distributed with this software.

    HISTORY
           This service was introduced with Postfix version 2.8.

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

                                                                        DNSBLOG(8)