You can de-authorize your device and re-authorize it with your correct email addess.
In Adobe Digital Edition (ADE), if you press Ctrl+Shift+D (Windows) or Cmd+Shift+D (Mac) will remove the activation on your computer, and allow you to reactivate with a different ID or the same ID when you launch ADE again.
Press "Ctrl+Shift+E", this will bring up the "Device Deactivation" dialog.
Select your Reader and deactivate it.
Unplug and replug your Reader
The Device Authorization dialog should show up, and you can authorize again with your Adobe ID.