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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/blacklist 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 resulting IP addresses sepa-rated separated
       rated  by  whitespace.   Otherwise  it  replies  with the query arguments plus an empty address list.
       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 exam-ples. examples.
       ples.

       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 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, "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 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)