I'm not so sure that is a technology problem to be solved at
all. I'm more concerned, frankly, with the junk mail that ends
up in my snail-mail box than an occasional spam, no matter how
annoying it is.
I'm convinced that responsible actions on the part of the ISP
can remedy this type of behavior, even though it is after-the-fact
and reactive in nature.
As someone already mentioned, we need to stop thinking of the
Internet in US-centric fashions. The Internet spans continents
and has no regard for national boundaries or knee-jerk legislation.
Sorry; I just don't agree.
- paul