How often have you seen a standard confidentiality disclaimer at the end of an email? 
An email I recently received ended with this:
This email together with any attachment(s) is proprietary and confidential, intended for only the recipient(s) named above and contains information that is privileged. You are hereby notified that the dissemination, distribution or copying of this email or its contents including attachments is strictly prohibited. If you have received this email in error, or are not the named recipient(s), you are hereby notified that any review, dissemination, distribution or copying of this communication is prohibited by the sender and doing so constitutes a violation of the Electronic Communications Privacy Act, 18 U.S.C. section 2510-2521. Although precautions have been taken to make sure no viruses are present in this email, [company name] cannot accept responsibility for any loss or damage that may arise from the use of this email or attachment(s).
