man : dnsblog(8)
dnsblog - Postfix DNS blocklist logger
dnsblog [generic Postfix daemon options]
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.
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
How much time a Postfix daemon process may take to handle a
request before it is terminated by a built-in watchdog timer.
Optional list of DNS blocklist domains, filters and weight
The time limit for sending or receiving information over an
internal communication channel.
The process ID of a Postfix command or daemon process.
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.
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,
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 is temporary with Postfix version 2.7.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
May 21, 2013