Suppose that a user chooses to update his e-mail(he is already a registered user ).

He does that by clicking the edit button of a form where he can enter the new e-mail.

Suppose now, that he does NOT alter the e-mail after all, and it stays the same.

Would you print to the browser a message saying"There is the same e-mail in the db-please enter another one".

Is the above the logical way to go?