Have you ever thought what you send in email footer?
The information contained in this e-mail is private & confidential and may also be legally privileged. If you are not the intended recipient, please notify us, preferably by e-mail, and do not read, copy or disclose the contents of this message to anyone.
If I'm not the intended recipient (supposing I know how to guess this), how am I supposed to notify you, when I should not read the contents, so I should not know about fact that I should notify you?