I use "mailwasher"
www.mailwasher.net
Has a central database of known spammers and lets you add your own. I have the entire country of Korea on my reject list.
The neat thing I like is that it bounces the spam back as if you didn't exist.
I also use an ad blocker to stop banner ads and a pop-up stopper. Together, my internet experience is far friendlier and much more like it used to be in the good old days.
Maybe in time they'll learn?