DNSBLOG(8)                                                          DNSBLOG(8)




NAME
       dnsblog - Postfix DNS blocklist logger

SYNOPSIS
       dnsblog [generic Postfix daemon options]

DESCRIPTION
       The dnsblog(8) server implements an ad-hoc DNS blocklist lookup service
       that will 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 blocklist
       domain name and an IP address. If the address is listed under the DNS
       blocklist, the dnsblog(8) server logs the match and replies with the
       query arguments plus a non-zero status.  Otherwise it replies with the
       query arguments plus a zero status.  Finally, The dnsblog(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
              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 blocklist 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,
              "postfix/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 is temporary with Postfix version 2.7.

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



                                                                  May 21, 2013