Although in a perfect world, this test would only find spammers, in the real world it catches practically all legit mail sent from inside microsoft (non msn) corporation (since they seem to have a mail server running on every tech''s desktop and no one has PTR's or rDNS set up.
> -----Original Message----- > From: Len Conrad > This is perfectly justifiable if stop to ask "what legit server > can't/won't > have PTR, __ANY__ PTR?? Darn, even 100k spammers on subscriber networks > have PTRs. > > With the RBLs being taken out, the credentials tactic makes more > sense. and > no PTR is mother of all missing credentials. > > bad helo (totally under control of the mail admin) is the son of a mother. > > There must be some pressure on legit servers to look legit, and > NOT to look > like a spammer. --- [This E-mail scanned for viruses by Declude Virus] To Unsubscribe: http://www.ipswitch.com/support/mailing-lists.html List Archive: http://www.mail-archive.com/imail_forum%40list.ipswitch.com/ Knowledge Base/FAQ: http://www.ipswitch.com/support/IMail/
