How do I remove an email address from AutoFill WITHOUT RESTORING?

A few years ago, I accidentally typed an email address with a "." in it, and ever since, I keep sending emails to the wrong address.

I've removed it off of my Hotmail account etc, but the iPhone keeps remembering it as autofill, and it shows up before the real email address.

Because I did this shortly after I bought the phone, I cant restore back to that date, and I'm absolutely not willing to restore the phone.

There has to be a setting, or file somewhere on the phone that can be deleted?

(perhaps access it through my Mac/Windows?)