Mozilla 1.3 helps against spam!

Sorry the article is in german, but to cut a long thing short,
they testet it and found it very helpful, they even offer a download of
sample-spam which can be used by Mozilla to learn what spam is.

http://www.hardtecs4u.com/reviews/2003/mozilla1.3/

I use Mailwasher free edition and it does not filter too much (means some get through).