Mail Monitoring MIB
draft-ietf-madman-email-mib-05

Network Working Group                                Ned Freed, Innosoft
Internet Draft                             Steve Kille, ISODE Consortium
Obsoletes: 1566, 2249               <draft-ietf-madman-email-mib-05.txt>

                          Mail Monitoring MIB

                             December 1999

                          Status of this Memo

This document is an Internet-Draft and is in full conformance with all
provisions of Section 10 of RFC 2026.

Internet-Drafts are working documents of the Internet Engineering Task
Force (IETF), its areas, and its working groups.  Note that other groups
may also distribute working documents as Internet-Drafts.

Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time.  It is inappropriate to use Internet- Drafts as reference material
or to cite them other than as "work in progress."

The list of current Internet-Drafts can be accessed at
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The list of Internet-Draft Shadow Directories can be accessed at
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                            Copyright Notice

Copyright (C) The Internet Society (1999).  All Rights Reserved.

1.  Introduction

This memo defines a portion of the Management Information Base (MIB) for
use with network management protocols in the Internet community.
Specifically, this memo extends the basic Network Services Monitoring
MIB defined in RFC XXXX [16] to allow monitoring of Message Transfer
Agents (MTAs). It may also be used to monitor MTA components within
gateways.

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2.  Table of Contents

1 Introduction ....................................................    1
2 Table of Contents ...............................................    2
3 The SNMPv2 Network Management Framework .........................    2
4 Message Flow Model ..............................................    3
5 MTA Objects .....................................................    4
6 Definitions .....................................................    5
7 Changes made since RFC 2249 .....................................   34
8 Acknowledgements ................................................   35
9 References ......................................................   35
10 Security Considerations ........................................   37
11 Author and Chair Addresses .....................................   38
12 Full Copyright Statement .......................................   38

3.  The SNMPv2 Network Management Framework

The SNMP Management Framework presently consists of five major
components:

    o   An overall architecture, described in RFC 2571 [1].

    o   Mechanisms for describing and naming objects and events for the
        purpose of management. The first version of this Structure of
        Management Information (SMI) is called SMIv1 and described in
        RFC 1155 [2], RFC 1212 [3] and RFC 1215 [4]. The second version,
        called SMIv2, is described in RFC 2578 [5], RFC 2579 [6] and RFC
        2580 [7].

    o   Message protocols for transferring management information. The
        first version of the SNMP message protocol is called SNMPv1 and
        described in RFC 1157 [8]. A second version of the SNMP message
        protocol, which is not an Internet standards track protocol, is
        called SNMPv2c and described in RFC 1901 [9] and RFC 1906 [10].
        The third version of the message protocol is called SNMPv3 and
        described in RFC 1906 [10], RFC 2572 [11] and RFC 2574 [12].

    o   Protocol operations for accessing management information. The
        first set of protocol operations and associated PDU formats is
        described in RFC 1157 [8]. A second set of protocol operations
        and associated PDU formats is described in RFC 1905 [13].

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    o   A set of fundamental applications described in RFC 2573 [14] and
        the view-based access control mechanism described in RFC 2575
        [15].

Managed objects are accessed via a virtual information store, termed the
Management Information Base or MIB.  Objects in the MIB are defined
using the mechanisms defined in the SMI.

This memo specifies a MIB module that is compliant to the SMIv2. A MIB
conforming to the SMIv1 can be produced through the appropriate
translations. The resulting translated MIB must be semantically
equivalent, except where objects or events are omitted because no
translation is possible (use of Counter64). Some machine readable
information in SMIv2 will be converted into textual descriptions in
SMIv1 during the translation process. However, this loss of machine
readable information is not considered to change the semantics of the
MIB.

4.  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 is modelled as
occurring 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)   If necessary messages are converted into the format that's
       appropriate for the next hop. Conversion operations may be
       successful or unsuccessful.

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

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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 received. In this
case (1), (2), and (3) may all occur prior to storage. Other MTAs store
messages precisely as they are received and perform all expansions and
conversions during retransmission processing. So here only (1) occurs
prior to storage.  This leads to situations where, in general, a
measurement of messages received may not equal a measurement of messages
in store, or a measurement of messages stored may not equal a
measurement of messages retransmitted, or both.

5.  MTA Objects

If there are one or more MTAs on the host, the following MIB may be used
to monitor them. Any number of the MTAs on a single host or group of
hosts may be monitored. Each MTA is dealt with as a separate network
service and has its own applTable entry in the Network Services
Monitoring MIB.

The MIB described in this document covers only the portion which is
specific to the monitoring of MTAs. The network service related part of
the MIB is covered in RFC XXXX [8].

This MIB defines four tables. The first of these contains per-MTA
information that isn't specific to any particular part of MTA. The
second breaks each MTA down into a collection of separate components
called groups. Groups are described in detail in the comments embedded
in the MIB below. The third table provides a means of correlating
associations tracked by the network services MIB with specific groups
within different MTAs. Finally, the fourth table provides a means of
tracking any errors encountered during the operation of the MTA. The
first two tables must be implemented to conform with this MIB; the last
two are optional.

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6.  Definitions

MTA-MIB DEFINITIONS ::= BEGIN

IMPORTS
    OBJECT-TYPE, Counter32, Gauge32, MODULE-IDENTITY, mib-2
      FROM SNMPv2-SMI
    TimeInterval
      FROM SNMPv2-TC
    MODULE-COMPLIANCE, OBJECT-GROUP
      FROM SNMPv2-CONF
    SnmpAdminString
        FROM SNMP-FRAMEWORK-MIB
    applIndex, URLString
      FROM NETWORK-SERVICES-MIB;

mta MODULE-IDENTITY
    LAST-UPDATED "9912210000Z"
    ORGANIZATION "IETF Mail and Directory Management Working Group"
    CONTACT-INFO
      "        Ned Freed

       Postal: Innosoft International, Inc.
               1050 Lakes Drive
               West Covina, CA 91790
               US

       Tel: +1 626 919 3600
       Fax: +1 626 919 3614

       E-Mail: ned.freed@innosoft.com"
    DESCRIPTION
      "The MIB module describing Message Transfer Agents (MTAs)"
    REVISION "9912210000Z"
    DESCRIPTION
      "This revision, published in RFC YYYY, changes a number of
       DisplayStrings to SnmpAdminStrings. Note that this change
       is not strictly supported by SMIv2.  However, the alternative
       of deprecating the old objects and defining new objects
       would have a more adverse impact on backward compatibility
       and interoperability, given the particular semantics of
       these objects.  The defining reference for distinguished
       names has also been updated from RFC 1779 to RFC 2253."
    REVISION "9905120000Z"
    DESCRIPTION

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      "This revision fixes a number of technical problems found in
       previous versions: The conformance groups for different
       versions of this MIB have been corrected, the recommendation
       that an empty string be returned if the last operation was
       successful has been removed from
       mtaGroupInboundRejectionReason and
       mtaGroupOutboundConnectFailureReason as it conflicts
       with the stated purpose of these variables, and the
       required mtaStatusCode entry has been added to
       MtaGroupErrorEntry.  It should be noted that this last
       change in no way affects the bits on the wire."
    REVISION "9708170000Z"
    DESCRIPTION
      "This revision, published in RFC 2249, adds the
       mtaGroupDescription and mtaGroupURL fields, conversion
       operation counters, a group hierarchy description mechanism,
       counters for specific errors, oldest message IDs, per-MTA
       and per-group loop counters, and a new table for tracking
       any errors an MTA encounters."
    REVISION "9311280000Z"
    DESCRIPTION
      "The original version of this MIB was published in RFC 1566"
    ::= {mib-2 28}

mtaTable OBJECT-TYPE
    SYNTAX SEQUENCE OF MtaEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The table holding information specific to an MTA."
    ::= {mta 1}

mtaEntry OBJECT-TYPE
    SYNTAX MtaEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The entry associated with each MTA."
    INDEX {applIndex}
    ::= {mtaTable 1}

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MtaEntry ::= SEQUENCE {
    mtaReceivedMessages
      Counter32,
    mtaStoredMessages
      Gauge32,
    mtaTransmittedMessages
      Counter32,
    mtaReceivedVolume
      Counter32,
    mtaStoredVolume
      Gauge32,
    mtaTransmittedVolume
      Counter32,
    mtaReceivedRecipients
      Counter32,
    mtaStoredRecipients
      Gauge32,
    mtaTransmittedRecipients
      Counter32,
    mtaSuccessfulConvertedMessages
      Counter32,
    mtaFailedConvertedMessages
      Counter32,
    mtaLoopsDetected
      Counter32
}

mtaReceivedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages received since MTA initialization.
       This includes messages transmitted to this MTA from other
       MTAs as well as messages that have been submitted to the
       MTA directly by end-users or applications."
    ::= {mtaEntry 1}

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mtaStoredMessages OBJECT-TYPE
    SYNTAX Gauge32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of messages currently stored in the MTA.
       This includes messages that are awaiting transmission to
       some other MTA or are waiting for delivery to an end-user
       or application."
    ::= {mtaEntry 2}

mtaTransmittedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages transmitted since MTA initialization.
       This includes messages that were transmitted to some other
       MTA or are waiting for delivery to an end-user or
       application."
    ::= {mtaEntry 3}

mtaReceivedVolume OBJECT-TYPE
    SYNTAX Counter32
    UNITS "K-octets"
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total volume of messages received since MTA
       initialization, measured in kilo-octets.  This volume should
       include all transferred data that is logically above the mail
       transport protocol level.  For example, an SMTP-based MTA
       should use the number of kilo-octets in the message header
       and body, while an X.400-based MTA should use the number of
       kilo-octets of P2 data.  This includes messages transmitted
       to this MTA from other MTAs as well as messages that have
       been submitted to the MTA directly by end-users or
       applications."
    ::= {mtaEntry 4}

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mtaStoredVolume OBJECT-TYPE
    SYNTAX Gauge32
    UNITS "K-octets"
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total volume of messages currently stored in the MTA,
       measured in kilo-octets.  This volume should include all
       stored data that is logically above the mail transport
       protocol level.  For example, an SMTP-based MTA should
       use the number of kilo-octets in the message header and
       body, while an X.400-based MTA would use the number of
       kilo-octets of P2 data.  This includes messages that are
       awaiting transmission to some other MTA or are waiting
       for delivery to an end-user or application."
    ::= {mtaEntry 5}

mtaTransmittedVolume OBJECT-TYPE
    SYNTAX Counter32
    UNITS "K-octets"
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total volume of messages transmitted since MTA
       initialization, measured in kilo-octets.  This volume should
       include all transferred data that is logically above the mail
       transport protocol level.  For example, an SMTP-based MTA
       should use the number of kilo-octets in the message header
       and body, while an X.400-based MTA should use the number of
       kilo-octets of P2 data.  This includes messages that were
       transmitted to some other MTA or are waiting for delivery
       to an end-user or application."
    ::= {mtaEntry 6}

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mtaReceivedRecipients OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of recipients specified in all messages
       received since MTA initialization.  Recipients this MTA
       has no responsibility for, i.e. inactive envelope
       recipients or ones referred to in message headers,
       should not be counted even if information about such
       recipients is available.  This includes messages
       transmitted to this MTA from other MTAs as well as
       messages that have been submitted to the MTA directly
       by end-users or applications."
    ::= {mtaEntry 7}

mtaStoredRecipients OBJECT-TYPE
    SYNTAX Gauge32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of recipients specified in all messages
       currently stored in the MTA.  Recipients this MTA has no
       responsibility for, i.e. inactive envelope recipients or
       ones referred to in message headers, should not be
       counted.  This includes messages that are awaiting
       transmission to some other MTA or are waiting for
       delivery to an end-user or application."
    ::= {mtaEntry 8}

mtaTransmittedRecipients OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of recipients specified in all messages
       transmitted since MTA initialization.  Recipients this
       MTA had no responsibility for, i.e. inactive envelope
       recipients or ones referred to in message headers,
       should not be counted.  This includes messages that were
       transmitted to some other MTA or are waiting for
       delivery to an end-user or application."
    ::= {mtaEntry 9}

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mtaSuccessfulConvertedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages that have been successfully
       converted from one form to another since MTA
       initialization."
    ::= {mtaEntry 10}

mtaFailedConvertedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages for which an unsuccessful
       attempt was made to convert them from one form to
       another since MTA initialization."
    ::= {mtaEntry 11}

mtaLoopsDetected OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "A message loop is defined as a situation where the MTA
       decides that a given message will never be delivered to
       one or more recipients and instead will continue to
       loop endlessly through one or more MTAs.  This variable
       counts the number of times the MTA has detected such a
       situation since MTA initialization. Note that the
       mechanism MTAs use to detect loops (e.g., trace field
       counting, count of references to this MTA in a trace
       field, examination of DNS or other directory information,
       etc.), the level at which loops are detected (e.g., per
       message, per recipient, per directory entry, etc.), and
       the handling of a loop once it is detected (e.g., looping
       messages are held, looping messages are bounced or sent
       to the postmaster, messages that the MTA knows will loop
       won't be accepted, etc.) vary widely from one MTA to the
       next and cannot be inferred from this variable."
    ::= {mtaEntry 12}

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-- MTAs typically group inbound reception, queue storage, and
-- outbound transmission in some way, rather than accounting for
-- such operations only across the MTA as a whole. In the most
-- extreme case separate information will be maintained for each
-- different entity that receives messages and for each entity
-- the MTA stores messages for and delivers messages to.  Other
-- MTAs may elect to treat all reception equally, all queue
-- storage equally, all deliveries equally, or some combination
-- of this. Overlapped groupings are also possible, where an MTA
-- decomposes its traffic in different ways for different
-- purposes.

-- In any case, a grouping abstraction is an extremely useful for
-- breaking down the activities of an MTA. For purposes of
-- labelling this will be called a "group" in this MIB.

-- Each group contains all the variables needed to monitor all
-- aspects of an MTA's operation.  However, the fact that all
-- groups contain all possible variables does not imply that all
-- groups must use all possible variables. For example, a single
-- group might be used to monitor only one kind of event (inbound
-- processing, outbound processing, or storage). In this sort of
-- configuration any counters that are unused as a result of a
-- given MTA's use of the group construct must be inaccessible;
-- e.g., returning either a noSuchName error (for an SNMPv1 get),
-- or a noSuchInstance exception (for an SNMPv2 get).

-- Groups can be created at any time after MTA initialization. Once
-- a group is created it should not be deleted or its mtaGroupIndex
-- changed unless the MTA is reinitialized.

-- Groups are not necessarily mutually exclusive. A given event may
-- be recorded by more than one group, a message may be seen as
-- stored by more than one group, and so on.  Groups should be all
-- inclusive, however: if groups are implemented all aspects of an
-- MTA's operation should be registered in at least one group.
-- This freedom lets implementors use different sets of groups to
-- provide different "views" of an MTA.

-- The possibility of overlap between groups means that summing
-- variables across groups may not produce values equal to those in
-- the mtaTable. mtaTable should always provide accurate information
-- about the MTA as a whole.

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-- The term "channel" is often used in MTA implementations; channels
-- are usually, but not always, equivalent to a group. However,
-- this MIB does not use the term "channel" because there is no
-- requirement that an MTA supporting this MIB has to map its
-- "channel" abstraction one-to-one onto the MIB's group abstraction.

-- An MTA may create a group or group of groups at any time. Once
-- created, however, an MTA cannot delete an entry for a group from
-- the group table.  Deletion is only allowed when the MTA is
-- reinitialized, and is not required even then.  This restriction
-- is imposed so that monitoring agents can rely on group
-- assignments being consistent across multiple query operations.

-- Groups may be laid out so as to form a hierarchical arrangement,
-- with some groups acting as subgroups for other groups.
-- Alternately, disjoint groups of groups may be used to provide
-- different sorts of "snapshots" of MTA operation.  The
-- mtaGroupHierarchy variable provides an indication of how each
-- group fits into the overall arrangement being used.

-- Note that SNMP also defines and uses term "group". MTA groups are
-- NOT the same as SNMP groups.

mtaGroupTable OBJECT-TYPE
    SYNTAX SEQUENCE OF MtaGroupEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The table holding information specific to each MTA group."
    ::= {mta 2}

mtaGroupEntry OBJECT-TYPE
    SYNTAX MtaGroupEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The entry associated with each MTA group."
    INDEX {applIndex, mtaGroupIndex}
    ::= {mtaGroupTable 1}

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MtaGroupEntry ::= SEQUENCE {
    mtaGroupIndex
        INTEGER,
    mtaGroupReceivedMessages
        Counter32,
    mtaGroupRejectedMessages
        Counter32,
    mtaGroupStoredMessages
        Gauge32,
    mtaGroupTransmittedMessages
        Counter32,
    mtaGroupReceivedVolume
        Counter32,
    mtaGroupStoredVolume
        Gauge32,
    mtaGroupTransmittedVolume
        Counter32,
    mtaGroupReceivedRecipients
        Counter32,
    mtaGroupStoredRecipients
        Gauge32,
    mtaGroupTransmittedRecipients
        Counter32,
    mtaGroupOldestMessageStored
        TimeInterval,
    mtaGroupInboundAssociations
        Gauge32,
    mtaGroupOutboundAssociations
        Gauge32,
    mtaGroupAccumulatedInboundAssociations
        Counter32,
    mtaGroupAccumulatedOutboundAssociations
        Counter32,
    mtaGroupLastInboundActivity
        TimeInterval,
    mtaGroupLastOutboundActivity
        TimeInterval,
    mtaGroupLastOutboundAssociationAttempt
        TimeInterval,
    mtaGroupRejectedInboundAssociations
        Counter32,
    mtaGroupFailedOutboundAssociations
        Counter32,
    mtaGroupInboundRejectionReason
        SnmpAdminString,

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    mtaGroupOutboundConnectFailureReason
        SnmpAdminString,
    mtaGroupScheduledRetry
        TimeInterval,
    mtaGroupMailProtocol
        OBJECT IDENTIFIER,
    mtaGroupName
        SnmpAdminString,
    mtaGroupSuccessfulConvertedMessages
        Counter32,
    mtaGroupFailedConvertedMessages
        Counter32,
    mtaGroupDescription
        SnmpAdminString,
    mtaGroupURL
        URLString,
    mtaGroupCreationTime
        TimeInterval,
    mtaGroupHierarchy
        INTEGER,
    mtaGroupOldestMessageId
        SnmpAdminString,
    mtaGroupLoopsDetected
        Counter32
}

mtaGroupIndex OBJECT-TYPE
    SYNTAX INTEGER (1..2147483647)
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The index associated with a group for a given MTA."
    ::= {mtaGroupEntry 1}

mtaGroupReceivedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages received to this group since
       group creation."
    ::= {mtaGroupEntry 2}

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mtaGroupRejectedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages rejected by this group since
       group creation."
    ::= {mtaGroupEntry 3}

mtaGroupStoredMessages OBJECT-TYPE
    SYNTAX Gauge32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of messages currently stored in this
       group's queue."
    ::= {mtaGroupEntry 4}

mtaGroupTransmittedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages transmitted by this group since
       group creation."
    ::= {mtaGroupEntry 5}

mtaGroupReceivedVolume OBJECT-TYPE
    SYNTAX Counter32
    UNITS "K-octets"
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total volume of messages received to this group since
       group creation, measured in kilo-octets.  This volume
       should include all transferred data that is logically above
       the mail transport protocol level.  For example, an
       SMTP-based MTA should use the number of kilo-octets in the
       message header and body, while an X.400-based MTA should use
       the number of kilo-octets of P2 data."
    ::= {mtaGroupEntry 6}

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mtaGroupStoredVolume OBJECT-TYPE
    SYNTAX Gauge32
    UNITS "K-octets"
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total volume of messages currently stored in this
       group's queue, measured in kilo-octets.  This volume should
       include all stored data that is logically above the mail
       transport protocol level.  For example, an SMTP-based
       MTA should use the number of kilo-octets in the message
       header and body, while an X.400-based MTA would use the
       number of kilo-octets of P2 data."
    ::= {mtaGroupEntry 7}

mtaGroupTransmittedVolume OBJECT-TYPE
    SYNTAX Counter32
    UNITS "K-octets"
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total volume of messages transmitted by this group
       since group creation, measured in kilo-octets.  This
       volume should include all transferred data that is logically
       above the mail transport protocol level.  For example, an
       SMTP-based MTA should use the number of kilo-octets in the
       message header and body, while an X.400-based MTA should use
       the number of kilo-octets of P2 data."
    ::= {mtaGroupEntry 8}

mtaGroupReceivedRecipients OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of recipients specified in all messages
       received to this group since group creation.
       Recipients this MTA has no responsibility for should not
       be counted."
    ::= {mtaGroupEntry 9}

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mtaGroupStoredRecipients OBJECT-TYPE
    SYNTAX Gauge32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of recipients specified in all messages
       currently stored in this group's queue.  Recipients this
       MTA has no responsibility for should not be counted."
    ::= {mtaGroupEntry 10}

mtaGroupTransmittedRecipients OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of recipients specified in all messages
       transmitted by this group since group creation.
       Recipients this MTA had no responsibility for should not
       be counted."
    ::= {mtaGroupEntry 11}

mtaGroupOldestMessageStored OBJECT-TYPE
    SYNTAX TimeInterval
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Time since the oldest message in this group's queue was
       placed in the queue."
    ::= {mtaGroupEntry 12}

mtaGroupInboundAssociations OBJECT-TYPE
    SYNTAX Gauge32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of current associations to the group, where the
       group is the responder."
    ::= {mtaGroupEntry 13}

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mtaGroupOutboundAssociations OBJECT-TYPE
    SYNTAX Gauge32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of current associations to the group, where the
      group is the initiator."
    ::= {mtaGroupEntry 14}

mtaGroupAccumulatedInboundAssociations OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of associations to the group since
      group creation, where the MTA was the responder."
    ::= {mtaGroupEntry 15}

mtaGroupAccumulatedOutboundAssociations OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of associations from the group since
       group creation, where the MTA was the initiator."
    ::= {mtaGroupEntry 16}

mtaGroupLastInboundActivity OBJECT-TYPE
    SYNTAX TimeInterval
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Time since the last time that this group had an active
      inbound association for purposes of message reception."
    ::= {mtaGroupEntry 17}

mtaGroupLastOutboundActivity OBJECT-TYPE
    SYNTAX TimeInterval
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Time since the last time that this group had a
       successful outbound association for purposes of
       message delivery."
    ::= {mtaGroupEntry 18}

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mtaGroupLastOutboundAssociationAttempt OBJECT-TYPE
    SYNTAX TimeInterval
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Time since the last time that this group attempted
       to make an outbound association for purposes of
       message delivery."
    ::= {mtaGroupEntry 34}

mtaGroupRejectedInboundAssociations OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number of inbound associations the group has
      rejected, since group creation.  Rejected associations
      are not counted in the accumulated association totals."
    ::= {mtaGroupEntry 19}

mtaGroupFailedOutboundAssociations OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The total number associations where the group was the
      initiator and association establishment has failed,
      since group creation.  Failed associations are
      not counted in the accumulated association totals."
    ::= {mtaGroupEntry 20}

mtaGroupInboundRejectionReason OBJECT-TYPE
    SYNTAX SnmpAdminString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The failure reason, if any, for the last association this
      group refused to respond to. If no association attempt
      has been made since the MTA was initialized the value
      should be 'never'."
    ::= {mtaGroupEntry 21}

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mtaGroupOutboundConnectFailureReason OBJECT-TYPE
    SYNTAX SnmpAdminString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The failure reason, if any, for the last association attempt
      this group initiated. If no association attempt has been
      made since the MTA was initialized the value should be
      'never'."
    ::= {mtaGroupEntry 22}

mtaGroupScheduledRetry OBJECT-TYPE
    SYNTAX TimeInterval
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The amount of time until this group is next scheduled to
       attempt to make an association."
    ::= {mtaGroupEntry 23}

mtaGroupMailProtocol OBJECT-TYPE
    SYNTAX OBJECT IDENTIFIER
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "An identification of the protocol being used by this group.
      For an group employing OSI protocols, this will be the
      Application Context.  For Internet applications, the IANA
      maintains a registry of the OIDs which correspond to well-known
      message transfer protocols.  If the application protocol is
      not listed in the registry, an OID value of the form
      {applTCPProtoID port} or {applUDPProtoID port} are used for
      TCP-based and UDP-based protocols, respectively.  In either
      case 'port' corresponds to the primary port number being
      used by the group.  applTCPProtoID and applUDPProtoID are
      defined in the NETWORK-SERVICES-MIB, RFC XXXX."
    ::= {mtaGroupEntry 24}

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mtaGroupName OBJECT-TYPE
    SYNTAX SnmpAdminString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "A descriptive name for the group. If this group connects to
       a single remote MTA this should be the name of that MTA. If
       this in turn is an Internet MTA this should be the domain
       name.  For an OSI MTA it should be the string encoded
       distinguished name of the managed object using the format
       defined in RFC 2253.  For X.400(1984) MTAs which do not
       have a Distinguished Name, the RFC 2156 syntax
       'mta in globalid' used in X400-Received: fields can be
       used."
    ::= {mtaGroupEntry 25}

mtaGroupSuccessfulConvertedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages that have been successfully
       converted from one form to another in this group
       since group creation."
    ::= {mtaGroupEntry 26}

mtaGroupFailedConvertedMessages OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "The number of messages for which an unsuccessful
       attempt was made to convert them from one form to
       another in this group since group creation."
    ::= {mtaGroupEntry 27}

mtaGroupDescription OBJECT-TYPE
    SYNTAX SnmpAdminString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "A description of the group's purpose.  This information is
       intended to identify the group in a status display."
    ::= {mtaGroupEntry 28}

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mtaGroupURL OBJECT-TYPE
    SYNTAX URLString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "A URL pointing to a description of the group.  This
       information is intended to identify and briefly describe
       the group in a status display."
    ::= {mtaGroupEntry 29}

mtaGroupCreationTime OBJECT-TYPE
    SYNTAX TimeInterval
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Time since this group was first created."
    ::= {mtaGroupEntry 30}

mtaGroupHierarchy OBJECT-TYPE
    SYNTAX INTEGER (-2147483648..2147483647)
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Describes how this group fits into the hierarchy. A
       positive value is interpreted as an mtaGroupIndex
       value for some other group whose variables include
       those of this group (and usually others). A negative
       value is interpreted as a group collection code: Groups
       with common negative hierarchy values comprise one
       particular breakdown of MTA activity as a whole. A
       zero value means that this MIB implementation doesn't
       implement hierarchy indicators and thus the overall
       group hierarchy cannot be determined."
    ::= {mtaGroupEntry 31}

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mtaGroupOldestMessageId OBJECT-TYPE
    SYNTAX SnmpAdminString
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Message ID of the oldest message in the group's queue.
       Whenever possible this should be in the form of an
       RFC 822 msg-id; X.400 may convert X.400 message
       identifiers to this form by following the rules laid
       out in RFC2156."
    ::= {mtaGroupEntry 32}

mtaGroupLoopsDetected OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "A message loop is defined as a situation where the MTA
       decides that a given message will never be delivered to
       one or more recipients and instead will continue to
       loop endlessly through one or more MTAs.  This variable
       counts the number of times the MTA has detected such a
       situation in conjunction with something associated with
       this group since group creation.  Note that the
       mechanism MTAs use to detect loops (e.g., trace field
       counting, count of references to this MTA in a trace
       field, examination of DNS or other directory information,
       etc.), the level at which loops are detected (e.g., per
       message, per recipient, per directory entry, etc.), and
       the handling of a loop once it is detected (e.g., looping
       messages are held, looping messages are bounced or sent
       to the postmaster, messages that the MTA knows will loop
       won't be accepted, etc.) vary widely from one MTA to the
       next and cannot be inferred from this variable."
    ::= {mtaGroupEntry 33}

-- The mtaGroupAssociationTable provides a means of correlating
-- entries in the network services association table with the
-- MTA group responsible for the association.

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mtaGroupAssociationTable OBJECT-TYPE
    SYNTAX SEQUENCE OF MtaGroupAssociationEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The table holding information regarding the associations
       for each MTA group."
    ::= {mta 3}

mtaGroupAssociationEntry OBJECT-TYPE
    SYNTAX MtaGroupAssociationEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The entry holding information regarding the associations
       for each MTA group."
    INDEX {applIndex, mtaGroupIndex, mtaGroupAssociationIndex}
    ::= {mtaGroupAssociationTable 1}

MtaGroupAssociationEntry ::= SEQUENCE {
    mtaGroupAssociationIndex
        INTEGER
}

mtaGroupAssociationIndex OBJECT-TYPE
    SYNTAX INTEGER (1..2147483647)
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Reference into association table to allow correlation of
       this group's active associations with the association table."
    ::= {mtaGroupAssociationEntry 1}

-- The mtaGroupErrorTable gives each group a way of tallying
-- the specific errors it has encountered.  The mechanism
-- defined here uses RFC 1893 status codes to identify
-- various specific errors.  There are also classes for generic
-- errors of various sorts, and the entire mechanism is also
-- extensible, in that new error codes can be defined at any
-- time.

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mtaGroupErrorTable OBJECT-TYPE
    SYNTAX SEQUENCE OF MtaGroupErrorEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The table holding information regarding accumulated errors
       for each MTA group."
    ::= {mta 5}

mtaGroupErrorEntry OBJECT-TYPE
    SYNTAX MtaGroupErrorEntry
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "The entry holding information regarding accumulated
       errors for each MTA group."
    INDEX {applIndex, mtaGroupIndex, mtaStatusCode}
    ::= {mtaGroupErrorTable 1}

MtaGroupErrorEntry ::= SEQUENCE {
    mtaStatusCode
        INTEGER (4000000..5999999),
    mtaGroupInboundErrorCount
        Counter32,
    mtaGroupInternalErrorCount
        Counter32,
    mtaGroupOutboundErrorCount
        Counter32
}

mtaGroupInboundErrorCount OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Count of the number of errors of a given type that have
       been accumulated in association with a particular group
       while processing incoming messages. In the case of SMTP
       these will typically be errors reporting by an SMTP
       server to the remote client; in the case of X.400
       these will typically be errors encountered while
       processing an incoming message."
    ::= {mtaGroupErrorEntry 1}

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mtaGroupInternalErrorCount OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Count of the number of errors of a given type that have
       been accumulated in association with a particular group
       during internal MTA processing."
    ::= {mtaGroupErrorEntry 2}

mtaGroupOutboundErrorCount OBJECT-TYPE
    SYNTAX Counter32
    MAX-ACCESS read-only
    STATUS current
    DESCRIPTION
      "Count of the number of errors of a given type that have
       been accumulated in association with a particular group's
       outbound connection activities. In the case of an SMTP
       client these will typically be errors reported while
       attempting to contact or while communicating with the
       remote SMTP server. In the case of X.400 these will
       typically be errors encountered while constructing
       or attempting to deliver an outgoing message."
    ::= {mtaGroupErrorEntry 3}

mtaStatusCode OBJECT-TYPE
    SYNTAX INTEGER (4000000..5999999)
    MAX-ACCESS not-accessible
    STATUS current
    DESCRIPTION
      "An index capable of representing an Enhanced Mail System
       Status Code.  Enhanced Mail System Status Codes are
       defined in RFC 1893.  These codes have the form

           class.subject.detail

       Here 'class' is either 2, 4, or 5 and both 'subject' and
       'detail'  are integers in the range 0..999. Given a status
       code the corresponding index value is defined to be
       ((class * 1000) + subject) * 1000 + detail.  Both SMTP
       error response codes and X.400 reason and diagnostic codes
       can be mapped into these codes, resulting in a namespace
       capable of describing most error conditions a mail system
       encounters in a generic yet detailed way."
    ::= {mtaGroupErrorEntry 4}

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-- Conformance information

mtaConformance OBJECT IDENTIFIER ::= {mta 4}

mtaGroups      OBJECT IDENTIFIER ::= {mtaConformance 1}
mtaCompliances OBJECT IDENTIFIER ::= {mtaConformance 2}

-- Compliance statements

mtaCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC 1566 implementations
       which support the Mail Monitoring MIB for basic
       monitoring of MTAs."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFC1566Group}
    ::= {mtaCompliances 1}

mtaAssocCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC 1566 implementations
       which support the Mail Monitoring MIB for monitoring
       of MTAs and their associations."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFC1566Group, mtaRFC1566AssocGroup}
    ::= {mtaCompliances 2}

mtaRFC2249Compliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC 2249 implementations
       which support the Mail Monitoring MIB for basic
       monitoring of MTAs."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFC2249Group}
    ::= {mtaCompliances 5}

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mtaRFC2249AssocCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC 2249 implementations
       which support the Mail Monitoring MIB for monitoring of
       MTAs and their associations."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFC2249Group, mtaRFC2249AssocGroup}
    ::= {mtaCompliances 6}

mtaRFC2249ErrorCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC 2249 implementations
       which support the Mail Monitoring MIB for monitoring of
       MTAs and detailed errors."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFC2249Group, mtaRFC2249ErrorGroup}
    ::= {mtaCompliances 7}

mtaRFC2249FullCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC 2249 implementations
       which support the full Mail Monitoring MIB for
       monitoring of MTAs, associations, and detailed errors."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFC2249Group, mtaRFC2249AssocGroup,
                        mtaRFC2249ErrorGroup}
    ::= {mtaCompliances 8}

mtaRFCYYYYCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC YYYY implementations
       which support the Mail Monitoring MIB for basic
       monitoring of MTAs."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFCYYYYGroup}
    ::= {mtaCompliances 9}

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mtaRFCYYYYAssocCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC YYYY implementations
       which support the Mail Monitoring MIB for monitoring of
       MTAs and their associations."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFCYYYYGroup, mtaRFCYYYYAssocGroup}
    ::= {mtaCompliances 10}

mtaRFCYYYYErrorCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC YYYY implementations
       which support the Mail Monitoring MIB for monitoring of
       MTAs and detailed errors."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFCYYYYGroup, mtaRFCYYYYErrorGroup}
    ::= {mtaCompliances 11}

mtaRFCYYYYFullCompliance MODULE-COMPLIANCE
    STATUS current
    DESCRIPTION
      "The compliance statement for RFC YYYY implementations
       which support the full Mail Monitoring MIB for
       monitoring of MTAs, associations, and detailed errors."
    MODULE  -- this module
      MANDATORY-GROUPS {mtaRFCYYYYGroup, mtaRFCYYYYAssocGroup,
                        mtaRFCYYYYErrorGroup}
    ::= {mtaCompliances 12}

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-- Units of conformance

mtaRFC1566Group OBJECT-GROUP
    OBJECTS {
      mtaReceivedMessages, mtaStoredMessages,
      mtaTransmittedMessages, mtaReceivedVolume, mtaStoredVolume,
      mtaTransmittedVolume, mtaReceivedRecipients,
      mtaStoredRecipients, mtaTransmittedRecipients,
      mtaGroupReceivedMessages, mtaGroupRejectedMessages,
      mtaGroupStoredMessages, mtaGroupTransmittedMessages,
      mtaGroupReceivedVolume, mtaGroupStoredVolume,
      mtaGroupTransmittedVolume, mtaGroupReceivedRecipients,
      mtaGroupStoredRecipients, mtaGroupTransmittedRecipients,
      mtaGroupOldestMessageStored, mtaGroupInboundAssociations,
      mtaGroupOutboundAssociations,
      mtaGroupAccumulatedInboundAssociations,
      mtaGroupAccumulatedOutboundAssociations,
      mtaGroupLastInboundActivity, mtaGroupLastOutboundActivity,
      mtaGroupRejectedInboundAssociations,
      mtaGroupFailedOutboundAssociations,
      mtaGroupInboundRejectionReason,
      mtaGroupOutboundConnectFailureReason,
      mtaGroupScheduledRetry, mtaGroupMailProtocol, mtaGroupName}
    STATUS current
    DESCRIPTION
      "A collection of objects providing basic monitoring of MTAs.
       This is the original set of such objects defined in RFC
       1566."
    ::= {mtaGroups 10}

mtaRFC1566AssocGroup OBJECT-GROUP
    OBJECTS {
      mtaGroupAssociationIndex}
    STATUS current
    DESCRIPTION
      "A collection of objects providing monitoring of MTA
       associations.  This is the original set of such objects
       defined in RFC 1566."
    ::= {mtaGroups 11}

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mtaRFC2249Group OBJECT-GROUP
    OBJECTS {
      mtaReceivedMessages, mtaStoredMessages,
      mtaTransmittedMessages, mtaReceivedVolume, mtaStoredVolume,
      mtaTransmittedVolume, mtaReceivedRecipients,
      mtaStoredRecipients, mtaTransmittedRecipients,
      mtaSuccessfulConvertedMessages, mtaFailedConvertedMessages,
      mtaGroupReceivedMessages, mtaGroupRejectedMessages,
      mtaGroupStoredMessages, mtaGroupTransmittedMessages,
      mtaGroupReceivedVolume, mtaGroupStoredVolume,
      mtaGroupTransmittedVolume, mtaGroupReceivedRecipients,
      mtaGroupStoredRecipients, mtaGroupTransmittedRecipients,
      mtaGroupOldestMessageStored, mtaGroupInboundAssociations,
      mtaGroupOutboundAssociations, mtaLoopsDetected,
      mtaGroupAccumulatedInboundAssociations,
      mtaGroupAccumulatedOutboundAssociations,
      mtaGroupLastInboundActivity, mtaGroupLastOutboundActivity,
      mtaGroupLastOutboundAssociationAttempt,
      mtaGroupRejectedInboundAssociations,
      mtaGroupFailedOutboundAssociations,
      mtaGroupInboundRejectionReason,
      mtaGroupOutboundConnectFailureReason,
      mtaGroupScheduledRetry, mtaGroupMailProtocol, mtaGroupName,
      mtaGroupSuccessfulConvertedMessages,
      mtaGroupFailedConvertedMessages, mtaGroupDescription,
      mtaGroupURL, mtaGroupCreationTime, mtaGroupHierarchy,
      mtaGroupOldestMessageId, mtaGroupLoopsDetected}
    STATUS current
    DESCRIPTION
      "A collection of objects providing basic monitoring of MTAs.
       This group was originally defined in RFC 2249."
    ::= {mtaGroups 4}

mtaRFC2249AssocGroup OBJECT-GROUP
    OBJECTS {
      mtaGroupAssociationIndex}
    STATUS current
    DESCRIPTION
      "A collection of objects providing monitoring of MTA
       associations.  This group was originally defined in RFC
       2249."
    ::= {mtaGroups 5}

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mtaRFC2249ErrorGroup OBJECT-GROUP
    OBJECTS {
      mtaGroupInboundErrorCount, mtaGroupInternalErrorCount,
      mtaGroupOutboundErrorCount}
    STATUS current
    DESCRIPTION
      "A collection of objects providing monitoring of
       detailed MTA errors.  This group was originally defined
       in RFC 2249."
    ::= {mtaGroups 6}

mtaRFCYYYYGroup OBJECT-GROUP
    OBJECTS {
      mtaReceivedMessages, mtaStoredMessages,
      mtaTransmittedMessages, mtaReceivedVolume, mtaStoredVolume,
      mtaTransmittedVolume, mtaReceivedRecipients,
      mtaStoredRecipients, mtaTransmittedRecipients,
      mtaSuccessfulConvertedMessages, mtaFailedConvertedMessages,
      mtaGroupReceivedMessages, mtaGroupRejectedMessages,
      mtaGroupStoredMessages, mtaGroupTransmittedMessages,
      mtaGroupReceivedVolume, mtaGroupStoredVolume,
      mtaGroupTransmittedVolume, mtaGroupReceivedRecipients,
      mtaGroupStoredRecipients, mtaGroupTransmittedRecipients,
      mtaGroupOldestMessageStored, mtaGroupInboundAssociations,
      mtaGroupOutboundAssociations, mtaLoopsDetected,
      mtaGroupAccumulatedInboundAssociations,
      mtaGroupAccumulatedOutboundAssociations,
      mtaGroupLastInboundActivity, mtaGroupLastOutboundActivity,
      mtaGroupLastOutboundAssociationAttempt,
      mtaGroupRejectedInboundAssociations,
      mtaGroupFailedOutboundAssociations,
      mtaGroupInboundRejectionReason,
      mtaGroupOutboundConnectFailureReason,
      mtaGroupScheduledRetry, mtaGroupMailProtocol, mtaGroupName,
      mtaGroupSuccessfulConvertedMessages,
      mtaGroupFailedConvertedMessages, mtaGroupDescription,
      mtaGroupURL, mtaGroupCreationTime, mtaGroupHierarchy,
      mtaGroupOldestMessageId, mtaGroupLoopsDetected}
    STATUS current
    DESCRIPTION
      "A collection of objects providing basic monitoring of MTAs.
       This is the appropriate group for RFC YYYY."
    ::= {mtaGroups 7}

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mtaRFCYYYYAssocGroup OBJECT-GROUP
    OBJECTS {
      mtaGroupAssociationIndex}
    STATUS current
    DESCRIPTION
      "A collection of objects providing monitoring of MTA
       associations.  This is the appropriate group for RFC
       YYYY association monitoring."
    ::= {mtaGroups 8}

mtaRFCYYYYErrorGroup OBJECT-GROUP
    OBJECTS {
      mtaGroupInboundErrorCount, mtaGroupInternalErrorCount,
      mtaGroupOutboundErrorCount}
    STATUS current
    DESCRIPTION
      "A collection of objects providing monitoring of
       detailed MTA errors.  This is the appropriate group
       for RFC YYYY error monitoring."
    ::= {mtaGroups 9}

END

7.  Changes made since RFC 2249

This revision corrects a number of minor technical errors in the
construction of the mail monitoring MIB in RFC 2249 [18]:

 (1)   All DisplayStrings have been changed to SnmpAdminStrings,

 (2)   the conformance groups for different versions of this MIB have
       been corrected,

 (3)   the required mtaStatusCode entry has been added to
       MtaGroupErrorEntry (which does not affect the bits on the wire in
       any way), and

 (4)   the recommendation that an empty string be returned if the last
       operation was successful has been removed from
       mtaGroupInboundRejectionReason and
       mtaGroupOutboundConnectFailureReason as it conflicts with the
       stated purpose of these variables.

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8.  Acknowledgements

This document is a work product of the Mail and Directory Management
(MADMAN) Working Group of the IETF. It is based on an earlier MIB
designed by S. Kille, T. Lenggenhager, D. Partain, and W. Yeong. The
Electronic Mail Association's TSC committee was instrumental in
providing feedback on and suggesting enhancements to RFC 1566 [19] that
have led to the present document.

9.  References

[1]  Harrington, D., Presuhn, R., and Wijnen, B., "An Architecture for
     Describing SNMP Management Frameworks", RFC 2571, April 1999.

[2]  Rose, M. and McCloghrie, K., "Structure and Identification of
     Management Information for TCP/IP-based Internets", RFC 1155, May
     1990.

[3]  Rose, M. and McCloghrie, K., "Concise MIB Definitions", RFC 1212,
     March 1991.

[4]  Rose, M., "A Convention for Defining Traps for use with the SNMP",
     RFC 1215, March 1991.

[5]  McCloghrie, K., Perkins, D., and Schoenwaelder, J., "Structure of
     Management Information Version 2 (SMIv2)", RFC 2578, April 1999.

[6]  McCloghrie, K., Perkins, D., and Schoenwaelder, J., "Textual
     Conventions for SMIv2", RFC 2579, April 1999.

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[7]  McCloghrie, K., Perkins, D., and Schoenwaelder, J., "Conformance
     Statements for SMIv2", RFC 2580, April 1999.

[8]  Case, J., Fedor, M., Schoffstall, M., and Davin, J., "Simple
     Network Management Protocol", RFC 1157, May 1990.

[9]  Case, J., McCloghrie, K., Rose, M., and Waldbusser, S.,
     "Introduction to Community-based SNMPv2", RFC 1901, January 1996.

[10] Case, J., McCloghrie, K., Rose, M., and Waldbusser, S., "Transport
     Mappings for Version 2 of the Simple Network Management Protocol
     (SNMPv2)", RFC 1906, January 1996.

[11] Case, J., Harrington D., Presuhn R., and Wijnen, B., "Message
     Processing and Dispatching for the Simple Network Management
     Protocol (SNMP)", RFC 2572, April 1999.

[12] Blumenthal, U., and Wijnen, B., "User-based Security Model (USM)
     for version 3 of the Simple Network Management Protocol (SNMPv3)",
     RFC 2574, April 1999.

[13] Case, J., McCloghrie, K., Rose, M., and Waldbusser, S., "Protocol
     Operations for Version 2 of the Simple Network Management Protocol
     (SNMPv2)", RFC 1905, January 1996.

[14] Levi, D., Meyer, P., and Stewart, B., "SNMPv3 Applications", RFC
     2573, April 1999.

[15] Wijnen, B., Presuhn, R., and McCloghrie, K., "View-based Access
     Control Model (VACM) for the Simple Network Management Protocol
     (SNMP)", RFC 2575, April 1999.

[16] Freed, N. and Kille, S., "The Network Services Monitoring MIB",
     Internet Draft, May 1999.

[17] Wahl, M., Kille, S., Howes, T., "Lightweight Directory Access
     Protocol (v3): UTF-8 String Representation of Distinguished Names",
     RFC 2253, December 1997.

[18] Freed, N. and Kille, S., "Mail Monitoring MIB", RFC 2249, January
     1998.

[19] Freed, N. and Kille, S., "Mail Monitoring MIB", RFC 1566, January
     1994.

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[20] Kille, S., "Mapping between X.400(1988) and RFC 822/MIME", RFC
     2156, January 1998.

[21] Crocker, D., "Standard for the Format of ARPA Internet Text
     Message", STD 11, RFC 822, August 1982.

[22] Vaudreuil, G., "Enhanced Mail System Status Codes", RFC 1893,
     January 1996.

10.  Security Considerations

There are no management objects defined in this MIB that have a MAX-
ACCESS clause of read-write and/or read-create.  So, if this MIB is
implemented correctly, then there is no risk that an intruder can alter
or create any management objects of this MIB via direct SNMP SET
operations.

However, this MIB does provide passive information about the existence,
type, and configuration of applications on a given host that could
potentially indicate some sort of vulnerability. Finally, the
information MIB provides about network usage could be used to analyze
network traffic patterns.

SNMPv1 by itself is not a secure environment.  Even if the network
itself is secure (for example by using IPSec), even then, there is no
control as to who on the secure network is allowed to access and GET/SET
(read/change/create/delete) the objects in this MIB.

It is recommended that the implementers consider the security features
as provided by the SNMPv3 framework.  Specifically, the use of the
User-based Security Model RFC 2574 [12] and the View-based Access
Control Model RFC 2575 [15] is recommended.

It is then a customer/user responsibility to ensure that the SNMP entity
giving access to an instance of this MIB, is properly configured to give
access to the objects only to those principals (users) that have
legitimate rights to indeed GET or SET (change/create/delete) them.

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11.  Author and Chair Addresses

     Ned Freed
     Innosoft International, Inc.
     1050 Lakes Drive
     West Covina, CA 91790
     USA
      tel: +1 626 919 3600
      fax: +1 626 919 3614
      email: ned.freed@innosoft.com

     Steve Kille, MADMAN WG Chair
     ISODE Consortium
     The Dome, The Square
     Richmond TW9 1DT
     UK
       tel: +44 181 332 9091
       email: S.Kille@isode.com

12.  Full Copyright Statement

Copyright (C) The Internet Society (1999). All Rights Reserved.

This document and translations of it may be copied and furnished to
others, and derivative works that comment on or otherwise explain it or
assist in its implementation may be prepared, copied, published and
distributed, in whole or in part, without restriction of any kind,
provided that the above copyright notice and this paragraph are included
on all such copies and derivative works.  However, this document itself
may not be modified in any way, such as by removing the copyright notice
or references to the Internet Society or other Internet organizations,
except as needed for the purpose of developing Internet standards in
which case the procedures for copyrights defined in the Internet
Standards process must be followed, or as required to translate it into
languages other than English.

The limited permissions granted above are perpetual and will not be
revoked by the Internet Society or its successors or assigns.

This document and the information contained herein is provided on an "AS
IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING TASK
FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT
LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION HEREIN WILL NOT
INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR

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FITNESS FOR A PARTICULAR PURPOSE.

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