Can't log onto drupal with any email address
Consider editing the eMailId currently stored in the Drupal database, using PhpMyAdmin. And this by replacing that eMail ID with some other eMail ID that is usable for you.

Then use the "request new pasword" feature for that account, which should be mailed now to the eMail Id that you can work with. Use the password reset link and you should be up and running.

Does this help?