> What do you think folks, is that a good idea to reject emails from relays with > no PTR record?
Dmitry, <SOAPBOX> I would say absolutely not. While it certainly might be RFC mandated or recommended, the fact of the matter is that most ISPs treat reverse DNS as a non-necessity and coordinating changes for legitimate customers can sometimes be like pulling teeth and in some cases ISPs simply ignore/refuse to do reverse DNS changes or implementation. Additionally, because of the growing prevalence of firewalls/proxies/natting, the amount of people that actually care about reverse DNS has dropped dramatically. I've had conversations with high-end Admins who still don't even know what reverse DNS is or why it exists. It takes me 20 minutes to explain why they can't use FTP or IRC or explain the 30 second lag on connecting to XYZ service :-( Because of these reasons and probably quite a few more, forward/reverse DNS verification and PTR existence verification is simply too tough to implement and leads to excessive failures for legitimate users. I am not a person who is out to change the world unless I see it as a final-end solution and this is not one. This is the same argument I make about compliant-standards Nazi (Ximian, RFCIgnorant.org and UW) who will not implement simple fixes to work-around broken/non-compliant (read Microsoft) products. Do I think the companies care? no. Do I think they will change? maybe but unlikely. Do I need the solution to work regardless? absolutely. I work in reality not in academia or the ilk. A reasonable margin for error is critical to allowing crucial services such as email to work. A college student who loses a few emails, boohoo. A company that loses a few customers because email delivery was screwed up and I'm out of a job. This is the same reason I support SpamAssassins ability to TAG emails and do not implement deletion or bouncing of SPAM no matter what the score from SpamAssassin. </SOAPBOX> Regards, KAM _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [EMAIL PROTECTED] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
