yeah, it just allows you to receive email from people who don't know their email address. I have my full name @gmail and constantly get folks who send stuff to first.last@gmail
>Adding dots doesn't change your address, so dots aren't why you got someone else's mail. Instead, the sender probably mistyped or forgot the correct address.
Somehow there's a Google service (I am guessing mobile) that allow you to register
firstl.ast@gmail or f.irstlast@gmail, and then they will both get each other's email. Fundamentally if you allow any account to be created with a dot and without a dot (two accounts), but filter out the dot in the email received, it will cause a problem. The dot is one to one with the account, but filtered out becomes one to many with the email. Nobody seems to notice this logical issue.
From the link in the other comment in this thread