How to recover an account when a user entered a wrong email during signup?

Currently on my site's signup page there are two email fields and one password field. The logic is that if users don't enter their password correctly they can always recover it later with their email. However I notice that some users are managing to enter a wrong email twice (it bounces), and in this case, I'm not sure how to help them recover their account?

UPDATE:

What I'm trying to do here is recover an account when a user doesn't know the email they used to sign up (because they misspelled it), in which case there's no way we can send them an email, and I can't see a way for them to identify...