Gmail doesn't recognize dots in usernames, so to Gmail, email@example.com and firstname.lastname@example.org are the same. So while you can create a Gmail username with a dot, if an identical name exists without the dot, he'll get your email! Users have reported this weirdness for many months already, now it's confirmed by Google, albeit, not yet fixed.
I've run into this myself. I got email@example.com when I've registered firstname.lastname@example.org
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A 3fer day for google. Feel the luv????!?!?!!?!!?!? ;)