My MyDoom Doom

This new virus, MyDoom is doing my head in. Not because my PC is infected, but because it seems everyone else in the world is. I'm getting an increasing amount of emails a day to my furry address, getting near 100 virus emails a day. I didn't realise that a) I'd be on that many people's personal address book and b) They'd be stupid enough to run the attachment. McAfee throws a flid every time I get one of these emails so now I find it easier to disable McAfee and delete them manually. Does anyone know of an effective way of filtering these messages off? My server has SpamAssassin so perhaps there's a way of configuring that to get rid of these emails?

Please let me know, I'm going mad!