Henrik K wrote, at 04/08/2009 09:54 AM: > On Wed, Apr 08, 2009 at 09:09:58AM -0400, Jorey Bump wrote: >> It's a shame, because enforcing these checks would have a noticeable >> impact on spam, especially FCrDNS: >> >> http://en.wikipedia.org/wiki/Forward_Confirmed_reverse_DNS >> >> Sadly, I have been unable to uncover a method to use FCrDNS in a scoring >> system. Ideally, I would like to use SpamAssassin, but if anyone knows >> of another way, please share. > > Don't bother looking too hard. :) Postfix records FCrDNS in Received-headers > ("unknown" if not matching) and SpamAssassin uses that information in > RDNS_NONE rule.
Funny, I took that rule at face value and assumed it only indicated a missing PTR. Even funnier, I've been incrementally raising the score for months (currently at 4 points) looking for the sweet spot, so it seems I've been checking FCrDNS all along. Thanks for the info! Time to notch it up another point...
