If you use the DSL providers SMTP service (free with any decent DSL connection) for outgoing mail
isn't the problem solved?
The problem is what you and the 2 others aren't saying: you're avoiding saying "I do not want to receive E-mail from low cost business class Internet connections."
JUST SAY IT!
If I start blocking all E-mail from mailservers that have "mail" in the name, it would be stupid for me to keep repeating the mantra "It's OK, people can just change their mailserver from mail.example.com to goodmail.example.com, it's cheap, it's easy, and it will let them send mail to me!". That may be true, but it is irrelevant.
You're saying that there is something inherently wrong with reverse DNS entries that have an IP in them. You're doing so in order to slack off and use a cheap, broken anti-spam test rather than a good, thorough one. :)
When SBC started blocking port 25 we just switched our Exchange customers
outgoing mail to use smtp.sbcglobal.net (or whatever)...problem solved and no RDNS issues.
FWIW, I've found that about 1/2 the people that block based on funny reverse DNS entries also block some/many/all ISP mailservers.
-Scott
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