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, 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 (-1 if unavailable).  Finally, The dnsblog(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

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