10 Minute Mail APP
Using 10 Minute Mail is super easy: when you start the app, you'll get a randomly generated e-mail address along with a 10-minute countdown. That e-mail address will be valid during those 10 minutes only. Therefore, once the 10 minutes have passed, the e-mail address will become invalid. You can also hit the refresh button to generate a new account that'll also last 10 minutes.
10 Minute Mail is a really useful and easy-to-use tool that generates temporary e-mail accounts that you can use for different purposes.