A really cool Gmail trick

If you use your Gmail address to sign up for websites, newsletters, etc. you can use a trick to see if they send you unwanted email or sell your address to others. Normally you would use your email address such as me@gmail.com but you can use a plus sign ( + ) to mark the address because the plus sign and everything between it and the @ sign will be ignored. As an example if you were to sign up for my newsletter and wanted to make sure I'm not lying when I say I won't use your address just sign up as me+coolsites@gmail.com. The newsletter will go to me@gmail.com but be marked as going to me+coolsites@gmail.com . Then you can use Gmails filters to send that unwanted email to the spam folder or even just delete it.