Use Multiple Gmail address with one account and prevent spamming

Many websites guarantee that they wont sell your email address to third parties or spammers. But many of those sites may not keep up their promise and may sell your email address. Now there is a trick to find out those websites which are actually selling your email address.

If your Gmail login name was username@gmail.com and you are thinking to register in www.examplesite.com, while you fill out a registration form, instead of just entering username@gmail.com as your email, enter it as username+examplesite@gmail.com instead. When Gmail sees a "+" in an email address, it uses all the characters to the left of the plus sign to know who to send it to. So you still get the registration details. Hence you can get multiple email address with gmail.

Now when you get the spam mails, just click the Show Details link and you will see the complete address hence knowing which site has sold your email address.