dnsblog - Postfix DNS white/blacklist logger
dnsblog [generic Postfix daemon options]
(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
With each connection, the dnsblog
(8) server receives a DNS
white/blacklist domain name, an IP address, and an ID. If the IP 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, 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
Problems and transactions are logged to syslogd
Changes to main.cf
are picked up automatically, as dnsblog
processes run for only a limited amount of time. Use the command "
" to speed up a change.
The text below provides only a parameter summary. See postconf
more details including examples.
- config_directory (see 'postconf -d' output)
- The default location of the Postfix main.cf and master.cf
- 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
- 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
- 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)
- A prefix that is prepended to the process name in syslog
records, so that, for example, "smtpd" becomes
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
111 8th Avenue
New York, NY 10011, USA