A possible solution is to get the email account holder to send an email to [email protected]. Auto-reply with a password reset form, or a welcome email in the case with no existing account (maybe you could fast-track account creation here, with a link "Oops, please delete this account. I didn't mean to do that.").
It doesn't really solve the problem of figuring out which email address you used to create your account, but it allows you to provide feedback to the user that the account does/does not exist.
An alternative solution would be to just email whatever account you enter on the website, with the appropriate wording depending whether or not they have an existing account, but this approach seems like it'd be too easy to spam random people.
It doesn't really solve the problem of figuring out which email address you used to create your account, but it allows you to provide feedback to the user that the account does/does not exist.
An alternative solution would be to just email whatever account you enter on the website, with the appropriate wording depending whether or not they have an existing account, but this approach seems like it'd be too easy to spam random people.