Not sure if it's possible to get something that would integrate with the e-mail feature of the phone, I'm thinking it's have to be like a routing system through a web based spam filter...
I checked with my e-mail provider and I can't identify the spam the way I'd like to, I really would like to block by keywords rather than sender as I get the same subject but from loads of spoofed mail addresses...
The closest solution I've been able to find is this one:
SODA3 - Spam filter for POP3 Mobile Email
Anyone know of any other methods/apps at all?