Rec.ITU-T F.400/X.400 (11/1988)  � MESSAGE HANDLING SYSTEM AND SERVICE OVERVIEW
CONTENTS
PART 1 � INTRODUCTION
0 Introduction
1 Scope
2 References
3 Definitions
    3.1 Open systems interconnection
    3.2 Directory systems
4 Abbreviations
5 Conventions
PART 2 � GENERAL DESCRIPTION OF MHS
6 Purpose
7 Functional model of MHS
    7.1 Description of the MHS model
    7.2 Structure of messages
    7.3 Application of the MHS model
    7.4 Message store
8 Message transfer service
    8.1 Submission and delivery
    8.2 Transfer
    8.3 Notifications
    8.4 User agent
    8.5 Message store
    8.6 Access unit
    8.7 Use of the MTS in the provision of various services
9 IPM service
    9.1 IPM service functional model
    9.2 Structure of IP-messages
    9.3 IP-notifications
10 Intercommunication with physical delivery services
    10.1 Introduction
    10.2 Organizational configurations
11 Specialized access
    11.1 Introduction
    11.2 Teletex access
    11.3 Telex access
PART 3 � CAPABILITIES OF MHS
12 Naming and addressing
    12.1 Introduction
    12.2 Directory names
    12.3 O/R names
    12.4 O/R addresses
13 MHS use of directory
    13.1 Introduction
    13.2 Functional model
    13.3 Physical configurations
14 Distribution lists in MHS
    14.1 Introduction
    14.2 Properties of a DL
    14.3 Submission
    14.4 DL use of a directory
    14.5 DL expansion
    14.6 Nesting
    14.7 Recursion control
    14.8 Delivery
    14.9 Routing loop control
    14.10 Notifications
    14.11 DL handling policy
15 Security capabilities of MHS
    15.1 Introduction
    15.2 MHS security threats
    15.3 Security model
    15.4 MHS security capabilities
    15.5 Security management
16 Conversion in MHS
17 Use of the MHS in provision of public services
PART 4 � ELEMENTS OF SERVICE
18 Purpose
19 Classification
    19.1 Purpose of classification
    19.2 Basic message transfer service
    19.3 MT service optional user facilities
    19.4 Base MH/PD service intercommunication
    19.5 Optional user facilities for MH/PD service intercommunication
    19.6 Base message store
    19.7 MS optional user facilities
    19.8 Basic interpersonal messaging service
    19.9 IPM service optional user facilities
ANNEX A � Glossary of terms
ANNEX B � Definitions of elements of service
ANNEX C � Elements of service modifications with respect to the 1984 version
ANNEX D � Differences between CCITT Recommendation F.400 and ISO Standard 10021-1