Sorry to dredge up an old topic, but this came to mind when I was updating my registered email address earlier. I think there may be a workable variation on the original suggestion. When a person goes into the Control Panel to change the listed email address, go ahead and send a confirmation email to the new address the way it works now. However, in addition, also send an email to the old email address stating that an email change has been requested and providing a link to cancel the request. This way, if an untrustworthy sitter or someone else tries to screw with your Conquer Club settings, you'll get a notification email at your original email address. If you click the link in that email, the address listed in your profile will revert to the original setting. On the other hand, if you no longer have access to the original email account, it won't matter since there's no need to cancel the request.