The email address associated with your Jagex account is the one you use to log in and the one we use to send account-related emails. If you've lost access to your email, we suggest contacting your email service provider to try to regain access.
If you can't recall the email address linked to your Jagex account, we suggest trying to log in using any previous email addresses that you can remember.
For the sake of optimal account security, we're unable to modify your Jagex account email or disclose it to you.