How should emails containing classified information be labeled?

Emails containing classified information should be labeled with appropriate classification markings in the subject line. This practice is crucial as it immediately alerts recipients to the sensitivity of the information being conveyed, thereby ensuring that they handle the email according to established protocols for classified materials. Proper labeling helps maintain security and compliance with regulations governing the transmission of classified content, minimizing the risk of unauthorized access or mishandling.

Using a general subject line does not provide clear guidance on the nature of the content, potentially leading to inadvertent sharing or careless handling. Similarly, marking emails as confidential only may not accurately convey the full level of classification, while the option of having no special labeling fails to indicate that the information is sensitive at all. The requirement for specific classifications in the subject line is designed to foster a culture of caution and vigilance when dealing with sensitive information.