I found this out today (maybe I’m slow), I needed to have a 2nd email for something but it turns out if you have one gmail email you have infinite possible combination’s. First you can use @gmail.com or @googleemail.com. That’s nice and all but there is something even cooler that you can do. Apparently its dubbed the “plus trick”, for example your email address is firstname.lastname@example.org and you need an extra email address all you have to do is email@example.com this will still go to firstname.lastname@example.org.
@danbaby says you can also do email@example.com (periods work too, I confirmed this.)
I guess I’ll never need to make another email address again.
Someone asked for a practical use for this… Lets say a site requires your email but you know its going to spam you. You can set up a filter in gmail to put anything that goes to firstname.lastname@example.org to a spam folder. Now you can use that email carelessly :).