Email has very little to do the recovery process. The main things they focus on are Ip, Isp, First Passwords,Membership info and join date. Knowing or not knowing the email will not decrease or increase your chances of recovering a account.
The two biggest factors are creation date/ISP/IP and/or submitting the report from that creation IP/ISP.
So basically unless you've moved overseas and had a severe bout of amnesia, you'll be able to recover any account you've created with just that info. Membership info is not mandatory, neither are recovs/email.