The email my Dropbox account was created/registered with ... has had to be disabled due to fraudulent activity.
Dropbox expired my password.
Unless you have another device already signed in to your Dropbox account, you likely won't be able to gain access to it. Dropbox will only send the reset information to the email address associated with your account. Your best bet will be to contact your previous email provider and try to get the account reactivated.