Allot of different websites offer this feature, but, how about making it so that if you somehow in someway can't login to your account after reporting missing credentials, it will offer you the chance to send the email about (e.g resetting your password) to an email that you can access.

I tried reset my password but I wrote bad name "toxic939" (toxic929) and twitch send email to unknown adress. Now i can't return to Twitch .. and do not come any password reset email.