Guerrilla Mail provides you with disposable e-mail addresses which expire after 15 Minutes. You can read and reply to e-mails that are sent to the temporary e-mail address within the given time frame.
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10MinuteMail offers users the ability to use a randomly generated, free 10 minute temporary email address that should definitely fill the need of a fast, simple, and one-time temporary email address quite easily (and it automatically updates too!).
extremely simple and easy to use temporary email service that definitely makes temporary email fast. Simply click "Create New Mailbox" and immediately you have a new, randomly generated temporary email address for use anywhere on the web. Emails are kept for 3 hours, but can be easily extended. Another great feature of MintMail, is the ability to forward emails to any other email address for a certain amount of time to get only the few emails you need without having to constantly check MintMail.