Can't sign out of my old apple id on macbook air OSX El Captain 10.11.6
My old email is completely disabled and inaccessible. I changed it to new one on my iphone successfully. Now, I can't log out of the old apple id on my mac, so the problem is similar to:
https://discussions.apple.com/thread/7830558
However, because my old email is disabled I can't reset my current apple id back to the old one either because it sends a confirmation email to it. How should I fix it then?
MacBook Air 13″, OS X 10.11