For details of this crap, I reference my post a couple days ago of the long list of rejects from Scott's network provider, charter, whose subscriber nets are spam factories.
Len, could you please lay off the personal attacks?
The point is that the spew from subscriber networks is so overwhelmingly, egregiously crap in both the mail from: and helo, it's not worth handling anything from those networks until those network operators stop the abuse.
To recap, you are saying "I don't mind blocking some legitimate E-mail, if I can block a lot of spam." Again, you're welcome to do this, if you don't mind false positives. And you're welcome to encourage others to do this, just so long as they know that they will be blocking legitimate E-mail, and that there are alternatives.
However, you can achieve much better results by using EASYNET-DYNA (which includes the attbi.com IPs, but excludes the ones used by known mailservers). And you can significantly reduce your false positives by using a weighting system.
-Scott
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