Manual Reference Pages - DNSBLOG (8postfix)
Postfix DNS white/blacklist logger
dnsblog [generic Postfix daemon options]
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
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 separated by whitespace. Otherwise it replies
with the query arguments plus an empty address list. Finally,
The dnsblog(8) server closes the connection.
Problems and transactions are logged to
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 white/blacklist domains, filters and weight
The time limit for sending or receiving information over an internal
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, "postfix/smtpd".
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.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
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