[Fnoord]

Thank you, that is it!

I believe it was HN's Paul Graham who innovated wrt spam filters.

The provider I used was onto it (I used Mutt over SSH with them and all spam was in a seperate folder due to procmail IIRC but later they added spam and virus filters which you could customize), that was before Gmail existed though. They do the same, for free, but you pay with your privacy.