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The purpose of this International Standard is to provide APIs supporting the development of applications that are users of the message transfer system, and gateways that incorporate or use X.400 mail functionality. This includes gateways between X.400 mail networks and proprietary mail systems. The interface supports access to X.400 services.

The interface is oriented towards the needs of gateways and applications that require full access to the features of the protocols.


There are industry-standard and proprietary APIs that can be used by simple applications that only require the main features of the protocols.

This International Standard defines two application program interfaces to X.400-based electronic messaging systems. The interfaces are:

(1) An X.400 API that makes the functionality of a message transfer system (MTS) accessible to a message store (MS) or user agent (UA), or the functionality of a simple MS accessible to a UA.

(2) An X.400 Gateway API that divides a message transfer agent (MTA) into two software components, a messaging system gateway and an X.400 gateway service.

This International Standard provides a language-independent specification.