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ITU-T X.411 (11/1995)

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Information technology – Message Handling Systems (MHS): Message transfer system: Abstract service definition and procedures
This Recommendation | International Standard contains an improved version of the P3 Register operation which introduces support for the Restricted Delivery element of service and adds general extensibility to the Register operation. The ASN.1 has been fully revised to use the new Recommendations X.680 and X.880, while retaining complete compatibility with the 1988 and 1992 P1 and P3 protocols. Numerous defect corrections are incorporated.
Citation: https://handle.itu.int/11.1002/1000/2957
Series title: X series: Data networks, open system communications and security
  X.400-X.499: Message Handling Systems
Approval date: 1995-11-21
Identical standard:ISO/IEC 10021-4:1997 (Common)
Approval process:TAP
Status: Superseded
Maintenance responsibility: ITU-T Study Group 17
Further details: Patent statement(s)