Military Message Handling System (MMHS) is a profile and set of extensions to X.400 for messaging in military environments. It is

NATO The North Atlantic Treaty Organization (NATO ; , OTAN), also called the North Atlantic Alliance, is an intergovernmental organization, intergovernmental Transnationalism, transnational military alliance of 32 Member states of NATO, member s ...

standard STANAG 4406 and CCEB standard ACP 123. It adds to standard X.400 email support for military requirements such as

mandatory access control In computer security, mandatory access control (MAC) refers to a type of access control by which a secured environment (e.g., an operating system or a database) constrains the ability of a ''subject'' or ''initiator'' to access or modify on an ' ...

(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 formats P2 (1984 standard) and P22 (1988 standard). MMHS specifications are implemented by several X.400 vendors, particularly those located in Europe, such as

Raytheon Raytheon is a business unit of RTX Corporation and is a major U.S. defense contractor and industrial corporation with manufacturing concentrations in weapons and military and commercial electronics. Founded in 1922, it merged in 2020 with Unite ...

UK, Boldon James, Deep-Secure,

Thales Group Thales S.A., Trade name, trading as Thales Group (), is a French multinational corporation, multinational aerospace and defence industry, defence corporation specializing in electronics. It designs, develops and manufactures a wide variety of aer ...

, Nexor, Cassidian and Isode. Several RFC are supported: RFC 6477 - Registration of Military Message Handling System (MMHS) Header Fields for Use in Internet Mail

Implementations

References

{{standard-stub Email

Implementations

See also

References