[conspire] (forw) [sorbs.net #212641] [Webform] SORBS registration systems sends RFC-ignorant mail

[Rick Moen]

Quoting Ruben Safir (ruben at mrbrklyn.com):

> But you can't reverse DNS check if the sending machine is behind a
> firewall/port forwarding or their dns name myhost.yahoo.com isn't an
> official host of yahoo.com

There _is no RFC requirement_ that MTA hosts have valid reverse DNS.

Some people elect to refuse mail from MTAs whose host lack reverse DNS,
(apparently as some sort of misguided antispam heuristic), but I don't.