A funny (and quite important) thing that very few people know: the dots in the email on gmail.com does not matter. Therefore, these addresses:
vasia.pupkin@gmail.com
va.sia.pup.kin@gmail.com
v.a.s.i.a.p.u.p.k.i.n@gmail.com
… are the same: vasiapupkin@gmail.com
This is sometimes used by scammers, because emails with dots which are not hosted on gmail are considered as different ones. Be careful!