This part of ISO/IEC ISP 10611 (AMH11) covers message transfer between message transfer agents (MTAs) using the P1 Message Transfer Protocol (see also figure 1).
These specifications form part of the Common Messaging application functions, as defined in the parts of ISO/IEC ISP 10611, which form a common basis for content type-dependent International Standardized Profiles for MHS that will be developed. An MTA which conforms to profiles AMH11n as specified in this part of ISO/IEC ISP 10611 shall support a normal mode. OSI protocol infrastructure (AMH111) as required by both ISO/IEC 10021-6 and the ITU-T X.400 Recommendations, and may additionally support an .X.410 mode. OSI protocol infrastructure (AMH112) as required, for ADMDs, by the ITU-T X.400 Recommendations.