I can't remember the email I used to apply (or when). I am currently trying to apply for varied positions. I have tried all email addresses that I can think of.
You can create a new account using a separate email address since you no longer have access to your old email account to proceed further. However, the new account will not provide access to information on the previous account.
Another option would be to reach out to the Unified Talent Applicant Support team, the team should be able to gather information on your account and help you replace the old email address with your current email address. You can contact the Unified Talent Applicant Support team from this direct link.
For us to assist you further, would you please provide us with the link to the site you are trying to rest the password for?