email Authentication

Good afternoon,
Today I discovered that I can not access my other account, today when I wanted to login to my accounts, a message appeared in which I mentioned that you had changed the keys. The problem is that I do not remember the mail of one of my accounts (sirguan3), in those accounts I have characters in two servers WOTLK and MOP then I already have a problem because I will not be able to enter because of their disposition.
I would like them to solve my case, as you will see this is my other account (sirguan).
If you have doubts you can appreciate the similarity of the names of my users.

Thank you