Hi, I'm interested in filtering mail relayed from hosts which have no reverse dns (PTR) record. A lot of MTAs support rejection of mail from such hosts, but I feel this will reject too much genuine mail, so I'm looking to approach the problem via Spam Assassin - perhaps score 1 or 2 for such mail.
I was suprised that Spam Assassin doesn't already have a rule for this, or that a plugin has not been written; or perhaps I'm looking in the wrong place? I'm aware of the tests Spam Assassin performs for PRT records for hotmail, excite, mail.com etc, but there don't seem to be any general rules. Thanks, Pete
