When you are asked for an email by a website and you do not want to give your personal email (for fear of spam), you can use a MailCatch account instead.
MailCatch is an email service that allows you to create temporary disposable mailboxes, in a completely anonymous way. No registration is required; you don’t have to enter any personal information to create an email account.
MailCatch includes some very interesting options like RSS feeds and choice of forwarding email to another account for up to one month etc. The email service is suitable, if you want to use it and throw away without records.
Mailinator is also a disposable email service and required no registration or signup to create an email account. You can use it in web forms, post it on forums or use it any time you need an email address, but don't want to be slowed down by the sign-up process or spammed for eternity