Hi
@taconinjasword5If you can't access your email account then the only way to unlink your Xbox account is by verifying your EA account details with an EA adviser, they can then unlink it for you.
If you can't verify your EA account details then they won't be able to do anything to help, It's too much of a security risk if you can't verify that you own the account.
My advise is to try and access the old email address or recreate it so you're able to change it or remove your Xbox account.