Best service ever, if it works - i just signed up. What it does is give you an ENTIRE SUBDOMAIN of email accounts... so anything@yourusername.endjunk.com is saved and filed by what "anything" they sent it to. So what you do is say you have to give Amazon.com an email address, you give them "amazon@yourusername.endjunk.com" and then if you start getting junkmail you know for a FACT that amazon was responsible for leaking/selling your email address, and you can filter it, swear at the webmaster, or forward all the mail back to them. It's a fantastic idea, one I've thought of before - but it's about time somebody automated it.