Standards
International Organization for Standardization (ISO)
International Electrotechnical Commission (IEC)
International Telecommunication Union (ITU/CCITT)
British Standards Institution (BSI)
European Electronic Messaging Association (EEMA)
Internet Engineering Task Force (IETF)
World Wide Web Consortium (W3C)
Internet Mail Consortium (IMC)
 
ISO/IEC JTC1/SC33/WG1 (formerly ISO/IEC JTC1/SC18/WG4)
UK Messaging Standards Group
Object Identifiers Registry
 
X.400 standards are available free from ITU-T
ITU-T Rec. F.400/X.400 | ISO/IEC 10021-1 Message handling system and service overview
ITU-T Rec. X.402 | ISO/IEC 10021-2 Message Handling Systems (MHS): Overall architecture
ITU-T Rec. X.411 ISO/IEC 10021-4 Message Handling Systems (MHS): Message Transfer System: Abstract Service Definition and Procedures
ITU-T Rec. X.413 | ISO/IEC 10021-5 Message Handling Systems (MHS): Message store - Abstract service definition
ITU-T Rec. X.419 | ISO/IEC 10021-6 Message Handling Systems (MHS): Protocol specifications
ITU-T Rec. X.420 | ISO/IEC 10021-7 Message Handling Systems (MHS): Interpersonal Messaging System
ITU-T Rec. X.435 | ISO/IEC 10021-9 Message Handling Systems (MHS): Electronic data interchange messaging system
ITU-T Rec. X.412 | ISO/IEC 10021-10 Message Handling Systems (MHS): MHS routing
ITU-T Rec. X.404 | ISO/IEC 10021-11 Message Handling Systems (MHS): MHS routing - Guide for messaging systems managers
 
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