Is there anyway to see which email is registered under an old account?

[Rolig Loon]

If you can log in to the account, you could go to the Contact information page for your dashboard at secondlife.com >>> Account . You can change the e-mail address for that account there. If it still asks for a password (I don't think it does), then the password it expects is your SL password, not the e-mail's password.

[Rolig Loon]

If you can log in to the account, you could go to the Contact information page for your dashboard at secondlife.com >>> Account . You can change the e-mail address for that account there. If it still asks for a password (I don't think it does), then the password it expects is your SL password, not the e-mail's password.

[Lindal Kidd]

Thank you for the additional information.

You can recover an account when you no longer recall the password or email, but it will take some effort.  File a Support Case, using Account Issue as the issue type.  Explain you don't recall any of the information (and include any information you DO recall.)  You will be asked to supply some positive proof of your identity, such as a scan of your driver's license or birth certificate.

EDIT:  No, the answer is not "no!"  Do you at least know the username?  If so, you can file a support ticket as I described above.  Be prepared to provide proof of identity.  Once LL is convinced that you are indeed you, and the owner of that account, they'll help you change your email and your account password.