I have this problem too. E-mail addresses are terrible identifiers. So many services fail to implement validation loops, and their customer support teams have

I have this problem too. E-mail addresses are terrible identifiers. So many services fail to implement validation loops, and their customer support teams have no process when I call. The presumption everywhere is that a provided e-mail address is correct. Even after I explain the situation, some representatives will refuse to help because I couldn't validate a birthday or last-four of a credit card.