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MTA-MIB by vendor RFC

MTA-MIB file content

The SNMP protocol is used to for conveying information and commands between agents and managing entities. SNMP uses the User Datagram Protocol (UDP) as the transport protocol for passing data between managers and agents. The reasons for using UDP for SNMP are, firstly it has low overheads in comparison to TCP, which uses a 3-way hand shake for connection. Secondly, in congested networks, SNMP over TCP is a bad idea because TCP in order to maintain reliability will flood the network with retransmissions.

Management information (MIB) is represented as a collection of managed objects. These objects together form a virtual information base called MIB. An agent may implement many MIBs, but all agents must implement a particular MIB called MIB-II [16]. This standard defines variables for things such as interface statistics (interface speeds, MTU, octets sent, octets received, etc.) as well as various other things pertaining to the system itself (system location, system contact, etc.). The main goal of MIB-II is to provide general TCP/IP management information.

Use ActiveXperts Network Monitor 2019 to import vendor-specific MIB files, inclusing MTA-MIB.


Vendor: RFC
Mib: MTA-MIB  [download]  [view objects]
Tool: ActiveXperts Network Monitor 2019 [download]    (ships with advanced SNMP/MIB tools)
-- WinAgents MIB Extraction Wizard
-- Extracted from rfc2789.txt 16.03.2005 20:21:51

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 "200003030000Z"
   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 "200003030000Z"
   DESCRIPTION
     "This revision, published in RFC 2789, 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 "199905120000Z"
   DESCRIPTION
     "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 "199708170000Z"
   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 "199311280000Z"
   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}

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}

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}

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}

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}

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}

-- 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.

-- 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}

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,
   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}

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}

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}

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}

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}

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}

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, OID
      values 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 protocol. The
      usual IANA procedures may be used to register ports for
      new protocols. applTCPProtoID and applUDPProtoID are
      defined in the NETWORK-SERVICES-MIB, RFC 2788."
   ::= {mtaGroupEntry 24}

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}

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}

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.

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.

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}

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}

-- 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}

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}

mtaRFC2789Compliance MODULE-COMPLIANCE
   STATUS current
   DESCRIPTION
     "The compliance statement for RFC 2789 implementations
      which support the Mail Monitoring MIB for basic
      monitoring of MTAs."
   MODULE  -- this module
     MANDATORY-GROUPS {mtaRFC2789Group}
   ::= {mtaCompliances 9}

mtaRFC2789AssocCompliance MODULE-COMPLIANCE
   STATUS current
   DESCRIPTION
     "The compliance statement for RFC 2789 implementations
      which support the Mail Monitoring MIB for monitoring of
      MTAs and their associations."
   MODULE  -- this module
     MANDATORY-GROUPS {mtaRFC2789Group, mtaRFC2789AssocGroup}
   ::= {mtaCompliances 10}

mtaRFC2789ErrorCompliance MODULE-COMPLIANCE

   STATUS current
   DESCRIPTION
     "The compliance statement for RFC 2789 implementations
      which support the Mail Monitoring MIB for monitoring of
      MTAs and detailed errors."
   MODULE  -- this module
     MANDATORY-GROUPS {mtaRFC2789Group, mtaRFC2789ErrorGroup}
   ::= {mtaCompliances 11}

mtaRFC2789FullCompliance MODULE-COMPLIANCE
   STATUS current
   DESCRIPTION
     "The compliance statement for RFC 2789 implementations
      which support the full Mail Monitoring MIB for
      monitoring of MTAs, associations, and detailed errors."
   MODULE  -- this module
     MANDATORY-GROUPS {mtaRFC2789Group, mtaRFC2789AssocGroup,
                       mtaRFC2789ErrorGroup}
   ::= {mtaCompliances 12}

-- 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}

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}

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}

mtaRFC2789Group 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 2789."
   ::= {mtaGroups 7}

mtaRFC2789AssocGroup OBJECT-GROUP
   OBJECTS {
     mtaGroupAssociationIndex}
   STATUS current
   DESCRIPTION
     "A collection of objects providing monitoring of MTA
      associations.  This is the appropriate group for RFC
      2789 association monitoring."
   ::= {mtaGroups 8}

mtaRFC2789ErrorGroup 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 2789 error monitoring."
   ::= {mtaGroups 9}

END