MailCatch is an email service that allows you to create temporary disposable mailboxes, in a completely anonymous way. When you are asked for an email by a website and you do not want to give your (for fear of spam), you can simply give whatever mailbox name you want on the mailcatch.com domain (like whatever@mailcatch.com). You then go to the MailCatch website and type in the mailbox name and check your mail.