There is an ever increasing amount of spam these days, what with various details being passed around different companies, it's getting easier for your email address to be picked up. There are a few options, Google mail will allow you to import your mail into it and has it's own spam filter, there are a few good paid for options, spam doctor is one I've used, a few freebies as well, I'm using the gmail option myself, as SR says though, sometimes the odd email is classed as spam, which goes straigt into the spam folder, you can still view and re-classify as not spam, with Gmail / Googlemail you get a huge inbox ( about 10 gig now IIRC ) so there's no need to delete often, you can sift through the spam as and when you like.