It's called GMail.
For some reason I've been experiencing an explosion of SPAM this week on the email account I've been using for, oh, about 10 years. With my regular GMail account I noticed that they have a wonderful SPAM filter which is just about spot-on with it's filtering.
I'm already hosting the mail accounts for my new LLC there, so finally decided to spend the half hour worth of time switching my kings-x.com domain email over. For some reason the changes "took" pretty quickly. By the end of the half hour the email seemed to be pretty much arriving at Google's servers instead of the GoDaddy servers (I was using the one free email hosting account you get there with each domain).
So far, so good. About 24 hours later you can see that GMail has already trapped well north of 200 SPAM messages. I'm not quite sure why a full fledged business would not use this free service.