I don't want to have to deal with yet another email account that I'll never check, that's all.
But if you switch to Verizon as your ISP, you will also have an email address that *they* give you, right? Or can you tell them not to assign you one?
He doesn't care that he HAS a cox e-mail address.
The problem is that they want to do all billing through it. In other words, he can't log into the cox page and use his g-mail address and have them send stuff there.
Rather, he has to log into his cox address for just that one thing, rather than just ignoring it. (I'm sure I have an ISP e-mail too that I've never logged into. I'd be annoyed if they forced me to use it for just one thing.)