Provided by: postfix_3.4.5-1ubuntu1_amd64 bug


       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)


       With each connection, the dnsblog(8) server receives a DNS white/blacklist domain name, an
       IP address, and an ID.  If the IP 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 resulting IP addresses, separated by whitespace, and the reply TTL.  Otherwise it
       replies  with  the query arguments plus an empty address list and the reply TTL; the reply
       TTL is -1 if there is no reply, or a negative reply that contains no SOA record.  Finally,
       the dnsblog(8) server closes the connection.


       Problems and transactions are logged to syslogd(8) or postlogd(8).


       Changes  to  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 and configuration 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

       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)
              A  prefix  that  is  prepended  to the process name in syslog records, so that, for
              example, "smtpd" becomes "prefix/smtpd".

       Available in Postfix 3.3 and later:

       service_name (read-only)
              The service name of a Postfix daemon process.


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

       Wietse Venema
       Google, Inc.
       111 8th Avenue
       New York, NY 10011, USA