> My experience has not been in large ISP's,
> but those small ones who get "creative" in their filters.
Yes, indeed. That's because their servers are melting down from the
torrents of spam and they're desperate. I know several of them, this is
what they tell me.
While we have to argue about filters in the short run, the only thing
that's going to make a difference in the long run is to stop the spam.
Technical means have clearly failed, maybe laws will work. See
John Levine, johnl @
com, Primary Perpetrator of "The Internet for Dummies",
Information Superhighwayman wanna-be, http://iecc.com/johnl, Sewer Commissioner
"I dropped the toothpaste", said Tom, crestfallenly.