GoogleMail.com is from Google only but how you will get this account from Google because you have no page to signup for this extension Googlemail.com.
I have a tricks and if you do that you can get email@example.com to firstname.lastname@example.org.
Let confuse our friends, colleagues and family member's and tell them that i have signed up for googlemail.com and its worth some dollars.
All you have to do is just give your old email id which you use for gmail.
Let's take an example
if you have email@example.com then ask them to send email to firstname.lastname@example.org.
Note : Username should be same
that means you dont have to create a new account for googlemail but gmail server will dispatch all your googlemail.com email to your gmail.com account but make sure to use the exact username which you used for gmail.