user cp, default thread subscription. Change that to no email. THen you'll need to unsubscribe to every thread you don't want an email about. Generally, you only need to go back a few, since at some point, most threads die off and don't get replied to any longer.
"What, exactly, is the internet? Basically it is a global network exchanging digitized data in such a way that any computer, anywhere, that is equipped with a device called a 'modem', can make a noise like a duck choking on a kazoo." - Dave Barry