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dnsblog - Postfix DNS allow/denylist logger
dnsblog [generic Postfix daemon options]
The dnsblog(8) server implements an ad-hoc DNS allow/denylist lookup
service. This may 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
allow/denylist domain name, an IP address, and an ID. If the IP
address is listed under the DNS allow/denylist, 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, and the
reply TTL. Otherwise it replies with the query arguments plus an empty
address list and the reply TTL; the reply TTL is -1 if there is no
reply, or a negative reply that contains no SOA record. Finally, the
dnsblog(8) server closes the connection.
Problems and transactions are logged to syslogd(8) or postlogd(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 con-
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 allow/denylist 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)
A prefix that is prepended to the process name in syslog
records, so that, for example, "smtpd" becomes "prefix/smtpd".
Available in Postfix 3.3 and later:
The master.cf service name of a Postfix daemon process.
smtpd(8), Postfix SMTP server
postconf(5), configuration parameters
postlogd(8), Postfix logging
syslogd(8), 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
111 8th Avenue
New York, NY 10011, USA