[dmurray]

Maybe their email is [e-mail], and people occasionally misremember your address and send your correspondence to them. In that case, yes.

More likely their email address is [e-mail] or [e-mail] though, in which cases the types of mistakes people make are likely asymmetric.

[jibal]

periods are ignored in gmail addresses so there's no difference between [e-mail] and [e-mail]