When sending an email with a classified attachment, how should the email be marked?

When sending an email with a classified attachment, the email should be marked as a transmittal document to accurately convey the nature of the content being shared. This means that the email should clearly indicate the classification level of both the email itself and the attachment. Marking the email appropriately not only provides context for the recipient but also promotes adherence to security protocols regarding classified information.

Classified documents are required to be properly marked to prevent unauthorized access and ensure that all individuals handling such information are aware of its sensitivity. By treating the email as a transmittal document, you are acknowledging the importance of maintaining the classification integrity of the information being transported, which is essential in safeguarding national security interests.

Additionally, marking it solely based on the attachment's classification does not take into account the email's own security requirements. An email containing a classified attachment, regardless of its own content, must still carry the necessary classification markings to ensure comprehensive protection throughout its transmission.