To make things worse, if you attempt to open an smtp connection to the helo host to verify they are at least a real mail server, you get a valid response.
try telneting to port 25 of any bogus .com or .net - you will see...
220 snubby1-wceast Snubby Mail Rejector Daemon v1.3 ready
this is a real bummer :)
We have an interim release that takes care of this problem, so that MAILFROM test will indeed fail on these bogus domains. Also, if you use anti-spam software that allows for RHSBL tests, you can set up a test named VERISCAM that uses the zone "." and a lookup IP of 64.94.110.11 ("VERISCAM rhsbl . 64.94.110.11 10 0" in Declude JunkMail).
-Scott
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