I've been WWW-in it since it first came about.....that's knocking on a bit now and I've tried an infinate number of E-mail providers. I'm currently with Google's G-mail and to-date it's the best I've tried. Spam is a thing of the past and there are so many ways to configure it to suit your own style. Well worth having a try.
I think it's still by invitation only, but PM me with your current E-mail address and I'll willingly send an 'invite.'
Ken.
You can sign up for G-mail here no need for an invite.
http://mail.google.com/mail/signup