DOKK / manpages / debian 12 / postfix / dnsblog.8postfix.en
DNSBLOG(8postfix) DNSBLOG(8postfix)

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.



  

  
The default location of the Postfix main.cf and master.cf configuration
      files.

  

  
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
    factors.

  

  
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.

  

  
The location of the Postfix top-level queue directory.

  

  
The syslog facility of Postfix logging.

  

  
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.








Wietse Venema
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA