 Fast mail is the mail provider that I use and I Their spam filtering is fantastic because not only do they have sort of a generic spam filter like like most mail providers do They also let you configure your own spam filter And it is very trainable Unlike Google's where you know you move a message out of the spam folder and then the next one that matches that just goes right back That's not what happens with fast mail. They're their engine actually listens to you and Messages you put into the spam Folder or delete from the spam folder are trained quote-unquote as spam Things you move out of the spam folder are trained as not spam and it really learns and listens