WotLK forgot my email ID

Hi... I Stoped playing for a while and now i want to be back .. But i was confused what Password i used in this account since i'm playing a lot of games
i tried multiple times i think the 3rd or the 4th try the password was automatically changed and the new password was sent to my Mailbox
but the problem is i also forgot what email i used for this account i just need the first 3letters of the Email ID was my account Linked to ..