that is what happens, apparantly this is becoming a real gmail problem.
you set up
a.smith@gmail.com
you are the only a smith so this is fine, someone else comes along and sets up
asmith@gmail.com gmail lets this happen as in the sign on you have a different id, but when it comes to processing the mail for a.smith it now send it to asmith as this is the . free account.
Try sending a mail to
D.A.M.I.E.N.O.N.E.I.L.L@GMAILdotCOM I bet that comes back to you also.