Resolving Duplicate User Entries in Mixpanel by Email Address

Hello everyone, we made a mistake when we used wrong userId (different one) for identifying users. Then we fixed it but now we have duplicate user entries in mixpanel. We also log e-mails, that are unique. Is there any possibility to tell mixpanel to join those accounts with same e-mail address? Or how would you approach solving this issue? Thank you very much in advance for any help, Filip