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.

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