ISO/IEC 10021

ISO/IEC 10021, Information technologyMessage Handling Systems (MHS) is the ISO standard which defines the overall system and service of an MHS and serves as a general overview of MHS.

Other aspects of Message Handling Systems and Services are defined in other parts of ISO/IEC 10021. The structure of ISO/IEC 10021 (all parts) defining the Message Handling System and Services is given in Table 1.

The technical aspects of MHS are defined in other parts of ISO/IEC 10021. The overall system architecture of MHS is defined in ISO/IEC 10021-2:1996.


  • ISO/IEC 10021-1:2003 Part 1: System and service overview
  • ISO/IEC 10021-2:2003 Overall architecture
  • ISO/IEC 10021-4:2003 Message transfer system – Abstract service definition and procedures
  • ISO/IEC 10021-5:1999 Message store: Abstract service definition
  • ISO/IEC 10021-6:2003 Protocol specifications
  • ISO/IEC 10021-7:2003 Interpersonal messaging system
  • ISO/IEC 10021-8:1999 Part 8: Electronic Data Interchange Messaging Service
  • ISO/IEC 10021-9:1999 Electronic Data Interchange Messaging System
  • ISO/IEC 10021-10:1999 MHS routing
  • ISO/IEC TR 10021-11:1999 MHS Routing – Guide for messaging systems managers

See also



ISO/IEC JTC 1/SC 6 Telecommunications and information exchange between systems is a standardization subcommittee of the Joint Technical Committee ISO/IEC JTC 1 of the International Organization for Standardization (ISO) and the International Electrotechnical Commission (IEC), that develops and facilitates standards within the field of telecommunications and information exchange between systems. ISO/IEC JTC 1/SC 6 was established in 1964, following the creation of a Special Working Group under ISO/TC 97 on Data Link Control Procedures and Modem Interfaces. The international secretariat of ISO/IEC JTC 1/SC 6 is the Korean Agency for Technology and Standards (KATS), located in the Republic of Korea.

List of International Organization for Standardization standards, 10000-10999

This is a list of published International Organization for Standardization (ISO) standards and other deliverables. For a complete and up-to-date list of all the ISO standards, see the ISO catalogue.The standards are protected by copyright and most of them must be purchased. However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available.


X.400 is a suite of ITU-T Recommendations that define standards for Data Communication Networks for Message Handling Systems (MHS) — more commonly known as email.

At one time, the designers of X.400 were expecting it to be the predominant form of email, but this role has been taken by the SMTP-based Internet e-mail. Despite this, it has been widely used within organizations and was a core part of Microsoft Exchange Server until 2006; variants continue to be important in military and aviation contexts.

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