The two email address are your_username@googlemail.com and your_username@gmail.com. You probably know about the latter one and use it to correspond with your friends, colleagues, etc.; now you can use the alternative (@googlemail.com) for other uses.
As we said before, the main use of this feature would be to make more than one account on a particular site, yet having all notifications and correspondence sent to the same inbox. The thing is the @gmail.com and @googlemail.com addresses are two completely separate emails to any site, excluding Google. Another useful way to incorporate this feature in your daily life is to separate work emails from other less important ones. For example, you could give out the @gmail.com address for any work-related purpose, and then have Gmail filter them out into a separate tag or such if you’d like. You can then use the @googlemail.com address for everything else, creating a more organized environment which you’ll be able to deal with more efficiently.
We have to say, having two email address is a well-known fact amongst many Gmail hardcore enthusiasts, but if you didn’t know about this little trick, now is a good time to start taking advantage of it. Note: If you need more email addresses for the same account, you can also use the “+” sign to add random text after your username.
