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Mail Monitoring MIB
RFC 1566

Document type: RFC - Proposed Standard (January 1994)
Obsoleted by RFC 2789, RFC 2249
Document stream: IETF
Last updated: 2013-03-02
Other versions: plain text, pdf, html

IETF State: (None)
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Document shepherd: No shepherd assigned

IESG State: RFC 1566 (Proposed Standard)
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Network Working Group                                 S. Kille, WG Chair
Request for Comments: 1566                              ISODE Consortium
Category: Standards Track                               N. Freed, Editor
                                                                Innosoft
                                                            January 1994

                          Mail Monitoring MIB

Status of this Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Table of Contents

   1. Introduction ................................................. 2
   2. The SNMPv2 Network Management Framework ...................... 2
   2.1 Object Definitions .......................................... 2
   3. Message Flow Model ........................................... 3
   4. MTA Objects .................................................. 3
   5. Definitions .................................................. 4
   6. Acknowledgements .............................................19
   7. References ...................................................19
   8. Security Considerations ......................................19
   9. Authors' Addresses ...........................................20

Kille & Freed                                                   [Page 1]
RFC 1566                  Mail Monitoring MIB               January 1994

1.  Introduction

   This memo defines a portion of the Management Information Base (MIB)
   for use with network management protocols in the Internet community.
   In particular, this memo extends the basic Network Services
   Monitoring MIB [5] to allow monitoring of Message Transfer Agents
   (MTAs). It may also be used to monitor MTA components within
   gateways.

2.  The SNMPv2 Network Management Framework

   The SNMPv2 Network Management Framework consists of four major
   components.  They are:

      o  RFC 1442 [1] which defines the SMI, the mechanisms used for
         describing and naming objects for the purpose of management.

      o  STD 17, RFC 1213 [2] defines MIB-II, the core set of managed
         objects for the Internet suite of protocols.

      o  RFC 1445 [3] which defines the administrative and other
         architectural aspects of the framework.

      o  RFC 1448 [4] which defines the protocol used for network
         access to managed objects.

   The Framework permits new objects to be defined for the purpose of
   experimentation and evaluation.

2.1  Object Definitions

   Managed objects are accessed via a virtual information store, termed
   the Management Information Base or MIB.  Objects in the MIB are
   defined using the subset of Abstract Syntax Notation One (ASN.1)
   defined in the SMI.  In particular, each object type is named by an
   OBJECT IDENTIFIER, an administratively assigned name.  The object
   type together with an object instance serves to uniquely identify a
   specific instantiation of the object.  For human convenience, we
   often use a textual string, termed the descriptor, to refer to the
   object type.

Kille & Freed                                                   [Page 2]
RFC 1566                  Mail Monitoring MIB               January 1994

3.  Message Flow Model

   A general model of message flow inside an MTA has to be presented
   before a MIB can be described. Generally speaking, message flow
   occurs in four steps:

   (1)  Messages are received by the MTA from User Agents, Message
        Stores, other MTAs, and gateways.

   (2)  The "next hop" for the each message is determined. This is
        simply the destination the message is to be transmitted to;
        it may or may not be the final destination of the message.
        Multiple "next hops" may exist for a single message (as a
        result of either having multiple recipients or distribution
        list expansion); this may make it necessary to duplicate
        messages.

   (3)  Messages are converted into the format that's appropriate
        for the next hop.

   (4)  Messages are transmitted to the appropriate destination,
        which may be a User Agent, Message Store, another MTA, or
        gateway.

   Storage of messages in the MTA occurs at some point during this
   process. However, it is important to note that storage may occur at
   different and possibly even multiple points during this process. For
   example, some MTAs expand messages into multiple copies as they are

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