Mailinator

Mailinator: "Its no signup, instant anti-spam service. Here is how it works: You are on the web, at a party, or talking to your favorite insurance salesman. Whereever you are, someone (or some webpage) asks for your email. You know if you give it, you'll be on their spam list. On the other hand, you do want at least one message from that person. The answer is to give them a mailinator address. You don't need to sign-up. You just make it up on the spot. "