Google used to have spam filtering as a (pay to use) service: http://www.google.com/postini http://www.google.com/postini. My e-mail (I don't use gmail) used it

Google used to have spam filtering as a (pay to use) service: http://www.google.com/postini http://www.google.com/postini. My e-mail (I don't use gmail) used it before it was shutdown. Now they use http://www.roaringpenguin.com/ http://www.roaringpenguin.com/.