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Military Message Handling System

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MMHS (Military Message Handling System) is a profile and set of extensions to X.400 for messaging in military environments. It is NATO standard STANAG 4406 and CCEB standard ACP.123. 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.). In particular it defines a new message format, P772 that is used in place of X.400's interpersonal message format P2.

MMHS specifications are implemented by several X.400 vendors, particularly those located in Europe.

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