Does anyone know a decent web based email provider that has a *good* spam guard?

I'm getting loads of emails selling !!!!!! and they're really annoying, they wont take no for an answer.

I've tried Yahoo!, Hotmail and Gmail and they all seem pretty crap.

Thanks for your help.

__________________
I Beat Anorexia.

If I have helped you, please consider donating a little cash to Cancer Research UK