In the fine print, "If you are not the named recipient and receive this correspondence in error, you must not copy, distribute or take any action in reliance on it and you should delete it from your system and notify the sender immediately. Thank you."
So I reply, and:
"Delivery has failed to these recipients or groups:
The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message. If the problem continues, please contact your helpdesk."
Really? Nice one ;-)