plugin announcement: FCrDNS

NAME
       Forward Confirmed RDNS - http://en.wikipedia.org/wiki/FCrDNS

DESCRIPTION
       Determine if the SMTP sender has matching forward and reverse =
DNS.

       Sets the connection note fcrdns.

WHY IT WORKS
       The reverse DNS of zombie PCs is out of the spam operators =
control.
       Their only way to pass this test is to limit themselves to hosts =
with
       matching forward and reverse DNS. At present, this presents a
       significant hurdle.


There's more POD that explains the tests, config settings, and method.=20=


Much like many other plugins, fcrdns is not reliable enough (only about =
90%)  to use for message rejection. However, when combined with any sort =
of heuristics system such as the karma plugin, the fcrdns plugin =
provides another extremely reliable indication of spam likelihood.=20

Matt=