I’ve got firstname.lastname@gmail.com and apparently someone with my same name believes they have the address with no dot, as they keep signing up for services like Facebook with it and sharing it with their friends who email me.
It is quite the odd situation. I reply to their friends saying they have the wrong email, but they don’t seem to believe me. And they keep signing up for things despite presumably never being able to actually access many of these services that require email verification.
My guess is it is someone not very computer literate. But it is always amusing.