A cover with security grading (e.g., 'Confidential', 'Secret', 'Top Secret') is not opened by CR. It is forwarded sealed to the addressee. Only the addressee or authorised persons open classified covers.
Source: CSMOP Para 11
What does 'security grading' mean for dak purposes?
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This answer is for informational purposes only and does not constitute legal advice. Always refer to the original rules and consult competent authorities for official interpretation.