Did you know that the dots in your email address don't matter? your.name@gmail.com is exactley the same as:y.o.u.r.n.a.m.e@gmail.com.
Adding a "+" to your email (eg: your.name+test@gmail.com will still go to your.name@gmail.com) means you can track who sent which email by handing out your email with the "+" in it plus an identifier (eg: your.name+annoying.company@gmail.com) and ignore of delete them.
More here: http://www.buzzfeed.com/danoshinsky/8-gmail-hacks-that-will-change-the-way-you-use-email?s=mobile
