It would be best to contact support and tell them that you want to change the eMail address.
Pick anything that comes to mind. Once that is completed, change the password.
You can now tell the new owner to log in with that User name and Password and change it to anything s/he wants and is unique.
May I commend you for your civic mindedness.
This world would be a nicer place if everyone would be as considerate as you are.
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