If you've ever wanted to sign up for a web account or newsletter, but didn't want to share your real e-mail address because of privacy or spam concerns, you may have already used a temporary e-mail service. The best one I've ever used is GuerrillaMail.com, and I'm not being paid to say this. I've found it to be significantly better than its competitors because it never actually asks you for your real e-mail address, and all your temporary mail is delivered to the online interface. The account also automatically expires in 15 minutes, but you can ask for more time. It may not work as well for someone who wants a longer term inbox, but nothing beats it for the quick stuff.