At 10:38 1/13/2004, Jeffrey Laramie wrote: >Right, but getting back to Dale's original concern, his virtual domains >won't fail the remote server's RDNS check if the DNS for his SMTP server >is configured correctly. And he shouldn't be afraid to use RDNS to check >the validity of a remote server. Even a couple of years ago spoofing was >relatively rare and a mail server that failed RDNS was not a big deal. >Today about half of the spam I see is rejected by RDNS before my users >see it. IMHO any SMTP server that fails RDNS is broken and should be fixed. True. However, most RDNS checks today are to determine that a mail server (ie. a connecting IP address) *has* a PTR record, not to match the PTR record with the HELO or MAIL FROM domain.
However, with that said, I do match the PTR record against a number of known spam source DNS names, and reject if I find it in that list... - To unsubscribe from this list: send the line "unsubscribe xmail" in the body of a message to [EMAIL PROTECTED] For general help: send the line "help" in the body of a message to [EMAIL PROTECTED]
