Mailinator

mailinator.net Web lovers finally have a weapon to use against their single worst enemy, Spam. Mailinator is a free, revolutionary new email service that provides
addresses you can give to dubious contacts and pestering businesses who you feel may misuse your personal email address or sell it to Spam services. There is no sign-up required, and users can make up their password on the spot. Each account is activated as soon as the first email is sent to it, so be sure to choose an original password as anyone with the same password can access the account. All emails are auto-deleted after a few hours, so reserve this great service for those salesman and business you don't really want to hear from ever again. [via cooltricks]