You could provide a delay feature… if you request this sort of reset, it takes 3 days, and emails are sent to the primary address every day with the count down. If your email isn’t lost, you would see these warnings.
You could let an account holder designate emergency contacts (other accounts) that are allowed to request a reset if you lose your primary email (again with a time delay to allow you to block malicious takeover attempts).
Recovery keys, security questions, real life identity proof, etc, are all other possible options, too.
You could provide a delay feature… if you request this sort of reset, it takes 3 days, and emails are sent to the primary address every day with the count down. If your email isn’t lost, you would see these warnings.
You could let an account holder designate emergency contacts (other accounts) that are allowed to request a reset if you lose your primary email (again with a time delay to allow you to block malicious takeover attempts).
Recovery keys, security questions, real life identity proof, etc, are all other possible options, too.