Sometimes you want to register on unprotected website which requires email activation but don't want to expose your email id to them. here is a simple way for you.
Go to www.10minutemail.com and click "Get my 10 Minute Mail e-mail address."

10MinuteMail gives you an e-mail address for 10 minutes so you join websites whcih you are afraid to recieve mails from it. But be sure that the mail you got will be only for 10 minutes.