I get quite a few email messages with text like:
IMPORTANT WARNING: This email (and any attachments) is only intended for the use of the person or entity to which it is addressed, and may contain information that is privileged and confidential. You, the recipient, are obligated to maintain it in a safe, secure and confidential manner. Unauthorized redisclosure or failure to maintain confidentiality may subject you to federal and state penalties. If you are not the recipient, please immediately notify us by return email, and delete this message from your computer.
(This example is from here.)
In fact, some email servers are configured to add such a warning automatically.
Do these warnings have any legal force? If so, what are their consequences?
Bonus question: I see reuse of a lot of the exact wording of the above example. (Google "only intended for the use of the person" and observe the many results.) What is the original source of this wording? Does it appear in a statute or some kind of official recommendation, or did one organization start using it and others followed the leader?