IMHO, AOL should be more creative in determining if the source is a residential or commercial service.
Very true. They are intentionally blocking legitimate E-mail, but they don't mention that to their customers.
I think Len pointed out that AOL may actually be doing something similar to that -- where it looks like they may be blocking mailservers based on a "residential-like" reverse DNS entry, but then later testing them to see if they are running actual mailservers.
All it would really take is connecting to port 25 on the IP in question, and seeing if the HELO greeting points back (via MX or A) to the IP in question. Voila; they now won't have false positives (except with incorrectly set up mailservers, that identify themselves improperly).
-Scott
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