Military Message Handling System (MMHS) is a profile and set of extensions to X.400 for messaging in military environments.
It adds to standard X.400 email support for military requirements such as mandatory access control (i.e. Classified/Secret/Top Secret messages and users, etc.).
MMHS specifications are implemented by several X.400 vendors, particularly those located in Europe, such as Raytheon UK, Boldon James,[1] Deep-Secure, Thales Group, Nexor, Cassidian and Isode.
Several RFC are supported: [2] This United States military article is a stub.
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