OSI/MHS Configuration and Management Manual

OSI/MHS Configuration and Management Manual—424827-003
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1 Introduction to OSI/MHS
The Open Systems Interconnection/Message Handling System (OSI/MHS) is an
implementation of the 1988 X.400 Message Handling System (MHS)
Recommendations. OSI/MHS allows you to build a large-scale X.400 messaging
network on HP NonStop™ computers. The OSI/MHS subsystem runs on most
computers that use the NonStop Kernel operating system. OSI/MHS can interoperate
with NonStop systems and other X.400 systems, including systems that follow the
1984 X.400 recommendations.
This section presents a brief overview of message handling systems and then
describes the OSI/MHS subsystem. It covers the following topics:
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X.400 message handling systems
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OSI/MHS
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Architecture
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Roles of OSI/MHS
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Standards implemented
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OSI/MHS components
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Configuration and control
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Message relay (MR) group
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Message store (MS) group
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Remote operations service (RS) group
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Local operations service (LO) group
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Gateway interface (GI) group
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OSI/MHS interface to OSI/AS
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Communication between remote MTAs and OSI/MHS
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Communication from remote user agents to OSI/MHS
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X.400 addressing
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Originator/recipient (O/R) address
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Route-selection criteria
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Application interfaces with OSI/MHS
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Transfer X400 gateways
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General user gateways (based on the Gateway Programmatic Interface)
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P7 API interface