I smiled when I saw these 2 signatures juxtaposed. The first is my own, on the basis of a government sponsored seminar on copyright and intellectual property, the second is clearly imposed on the sender by their company…
Any claims made at this point in a message are completely invalid as they are presented after the information they attempt to assert rights over has been disclosed without prior caveat
NOTICE AND DISCLAIMER
This e-mail (including any attachments) is intended for the above-named person(s). If you are not the intended recipient, notify the sender immediately, delete this email from your system and do not disclose or use for any purpose.
In the second case, if the sensitive information is solely in the attachments, and the attachment is flagged to be an attachment vs an inline body part, then it might have some slight weight as the contents will not yet have been disclosed.
Really though if you are sending private mail you need end-to-end encryption