Retrieving password for non working email address that is attached to an iCloud account

I have an iCloud account out that there that is attached to an email address that is no longer working. So I cannot do a password reset, because that email address is not working. So I cannot re-set it.

I need to get the pictures downloaded from that old iCloud account and add them to my new iCloud account. But I can't log in to get that done.

Hoping someone can help.

Vince