What is a primary consideration regarding the handling of classified information in postal correspondence?

When handling classified information in postal correspondence, one of the most critical considerations is the presence of security markings on the wrappers. These markings serve as vital indicators of the classification level of the information enclosed, guiding personnel in adhering to appropriate handling, storage, and transmission protocols. Proper security markings ensure that individuals interacting with the correspondence are aware of the sensitivity of the contents, which aids in preventing unauthorized access and ensuring compliance with established security measures.

The use of security markings is essential for safeguarding classified information throughout the mailing process, as they help to convey the necessary precautions that must be taken at every stage of handling. This focus on security is fundamental to maintaining the integrity of sensitive information within the confines of postal services.