can I check an email addy I've lost access to?

A number of years ago, I lost access to one of my emails from Comcast. It's a long story.

I'm sure that it's still out there, accounts I couldn't access. And I can't add them to be scanned because you get sent a code. Can't access the code.

Any way to add it so I can find all occurrences of it?

Thanks.