What additional markings should emails include aside from the banner?

Including portion markings and URLs in addition to the classification banner is important for providing context and clarification about the content of the email, particularly for documents that contain both classified and unclassified information. Portion markings indicate the classification level of specific sections of the text, allowing recipients to understand which parts of the email are sensitive. This is especially critical when information is not uniformly classified, as it guides recipients on how to handle and disseminate that information appropriately.

URLs may also be included if they direct recipients to resources or additional content relevant to the classified information. This additional context helps maintain operational security and ensures that all recipients have access to the right information while understanding its handling requirements.