HP 3000 Manuals

Installing and Configuring HP X.400 Administrator's Guide

Message Handling Environment (MHE) 

The MHEconsists of the following:

   *   Users

   *    

       Message Handling System

Figure 2-1 provides an overview of the MHE and the interactions between
the various components providing message handling services.


          Figure 2-1.  Message Handling Environment 

User 

The user may be either a person or computer application.  The user is
referred to as an originatorwhen sending a message, and a recipientwhen
receiving a message.

Message Handling System (MHS) 

The MHS is a collection of User Agents (UAs)and the Message Transfer
System (MTS). The MHS conveys messages from the originator to one or more
recipients.  It facilitates the preparation of messages, routes those
messages, recovers from errors, delivers the messages, and notifies users
of success or failure of operations.

User Agent (UA).    

The UA provides users with the ability to manage messages.  It also
provides them with access to their mail, and the capabilities to create,
send, and receive messages.

Message Transfer System (MTS).    

The MTS is a collection of one or more Message Transfer Agents (MTAs).
It provides the delivery service for messages.

Message Transfer Agent (MTA).    

The MTA is usually a node in a store-and-forward network with any number
of UAs associated with it.  The MTA is responsible for all envelope
generation and for passing messages through the network to the recipient.

MPE/iX 5.0 Documentation