Network Working Group N. Freed
Request for Comments: 2249 Innosoft
Obsoletes: 1566 S. Kille
Category: Standards Track ISODE Consortium
January 1998

Mail Monitoring MIB

Status of this Memo

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

Copyright Notice

Copyright (C) The Internet Society (1998). 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 [8] to allow monitoring of Message Transfer Agents (MTAs). It may
also be used to monitor MTA components within gateways.

2. Table of Contents

1 Introduction ............................................. 1
2 Table of Contents ........................................ 1
3 The SNMPv2 Network Management Framework .................. 2
3.1 Object Definitions ..................................... 2
4 Message Flow Model ....................................... 2
5 MTA Objects .............................................. 3
6 Definitions .............................................. 4
7 Changes made since RFC1566 .............................. 25
8 Acknowledgements ......................................... 26
9 References ............................................... 26
10 Security Considerations ................................. 27
11 Author and Chair Addresses .............................. 27
12 Full Copyright Statement ................................ 28

3. The SNMPv2 Network Management Framework

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

o RFC1902 [1] which defines the SMI, the mechanisms used for
describing and naming objects for the purpose of management.

o RFC1903 [2] defines textual conventions for SNMPv2.

o RFC1904 [3] defines conformance statements for SNMPv2.

o RFC1905 [4] defines transport mappings for SNMPv2.

o RFC1906 [5] defines the protocol operations used for network
Access to managed objects.

o RFC1907 [6] defines the Management Information Base for SNMPv2.

o RFC1908 [7] specifies coexistance between SNMP and SNMPv2.

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

3.1. Object Definitions

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

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 occuring 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.

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 a separate document [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.

6. Definitions

MTA-MIB DEFINITIONS ::= BEGIN

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

mta MODULE-IDENTITY
LAST-UPDATED "9708170000Z"
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 "9311280000Z"
DESCRIPTION
"The original version of this MIB was published in RFC1566"
::= {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}

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 RFC1893 [14]. 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."
::= {mta 6}

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 all unused counters would 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 differents "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 abstration.

-- 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. Deletation 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.

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
DisplayString,
mtaGroupOutboundConnectFailureReason
DisplayString,
mtaGroupScheduledRetry
TimeInterval,
mtaGroupMailProtocol
OBJECT IDENTIFIER,
mtaGroupName
DisplayString,
mtaGroupSuccessfulConvertedMessages
Counter32,
mtaGroupFailedConvertedMessages
Counter32,
mtaGroupDescription
DisplayString,
mtaGroupURL
URLString,
mtaGroupCreationTime
TimeInterval,
mtaGroupHierarchy
INTEGER,
mtaGroupOldestMessageId
DisplayString,
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 DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The failure reason, if any, for the last association this
group refused to respond to. An empty string indicates that
the last attempt was successful. If no association attempt
has been made since the MTA was initialized the value
should be 'never'."
::= {mtaGroupEntry 21}

mtaGroupOutboundConnectFailureReason OBJECT-TYPE
SYNTAX DisplayString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"The failure reason, if any, for the last association attempt
this group initiated. An empty string indicates that the last
attempt was successful. 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 time when this group is scheduled to next 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 {applUDProtoID 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 [8]."
::= {mtaGroupEntry 24}

mtaGroupName OBJECT-TYPE
SYNTAX DisplayString
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 RFC1779 [9]. For X.400(1984) MTAs which do not
have a Distinguished Name, the RFC1327 [12] syntax
'mta in globalid' should 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 DisplayString
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 DisplayString
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
RFC822 [13] msg-id; X.400 may convert X.400 message
identifiers to this form by following the rules laid
out in RFC1327 [12]."
::= {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 RFC1893 [14] 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 {
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 assocation 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 assocation 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 assocation 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}

-- 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 SNMPv2 entities which
implement the Mail Monitoring MIB for basic
monitoring of MTAs."
MODULE -- this module
MANDATORY-GROUPS {mtaGroup}
::= {mtaCompliances 1}

mtaAssocCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMPv2 entities which
implement the Mail Monitoring MIB for monitoring of
MTAs and their associations."
MODULE -- this module
MANDATORY-GROUPS {mtaGroup, mtaAssocGroup}
::= {mtaCompliances 2}

mtaErrorCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION
"The compliance statement for SNMPv2 entities which
implement the Mail Monitoring MIB for monitoring of
MTAs and detailed errors."
MODULE -- this module
MANDATORY-GROUPS {mtaGroup, mtaErrorGroup}
::= {mtaCompliances 3}

mtaFullCompliance MODULE-COMPLIANCE
STATUS current
DESCRIPTION

"The compliance statement for SNMPv2 entities which
implement the full Mail Monitoring MIB for monitoring
of MTAs, associations, and detailed errors."
MODULE -- this module
MANDATORY-GROUPS {mtaGroup, mtaAssocGroup, mtaErrorGroup}
::= {mtaCompliances 4}

-- Units of conformance

mtaGroup 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."
::= {mtaGroups 1}

mtaAssocGroup OBJECT-GROUP
OBJECTS {
mtaGroupAssociationIndex}
STATUS current
DESCRIPTION
"A collection of objects providing monitoring of MTA
associations."

::= {mtaGroups 2}

mtaErrorGroup OBJECT-GROUP
OBJECTS {
mtaGroupInboundErrorCount, mtaGroupInternalErrorCount,
mtaGroupOutboundErrorCount}
STATUS current
DESCRIPTION
"A collection of objects providing monitoring of
detailed MTA errors."
::= {mtaGroups 3}

END

7. Changes made since RFC1566

The only changes made to this document since it was issued as RFC
1566 [11] are the following:

(1) A number of DESCRIPTION fields have been reWorded, hopefully
making them clearer.

(2) mtaGroupDescription and mtaGroupURL fields have been added.
These fields are intended to identify and describe the MTA and
the various MTA groups.

(3) The time since the last outbound association attempt is now
distinct from the time since the last successfuol outbound
association attempt.

(4) Conversion operation counters have been added.

(5) A mechanism to explicitly describe group hierarchies has been
added.

(6) A mechanism to count specific sorts of errors has been added.

(7) A field for the ID of the oldest message in a group's queue
has been added.

(8) Per-MTA and per-group message loop counters have been added.

(9) A new table has been added to keep track of any errors an MTA
encounters.

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 RFC1566 [11]
that have led to the present document.

9. References

[1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Structure of Management Information for Version
2 of the Simple Network Management Protocol (SNMPv2)", RFC1902,
January 1996.

[2] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Textual Conventions for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1903, January 1996.

[3] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Conformance Statements for Version 2 of the
Simple Network Management Protocol (SNMPv2)", RFC1904, January
1996.

[4] SNMPv2 Working Grou, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Protocol Operations for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1905, January 1996.

[5] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Transport Mappings for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1906, January 1996.

[6] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Management Information Base for Version 2 of the
Simple Network Management Protocol (SNMPv2)", RFC1907, January
1996.

[7] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Coexistence between Version 1 and Version 2 of
the Internet-standard Network Management Framework", RFC1908,
January 1996.

[8] Freed, N., and S. Kille, "The Network Services Monitoring MIB",
RFC2248, January 1998.

[9] Kille, S., "A String Representation of Distinguished Names", RFC
1779, March 1995.

[10] Berners-Lee, T., Masinter, L. and M. McCahill, Uniform Resource
Locators (URL)", RFC1738, December 1994.

[11] Freed, N. and S. Kille, "Mail Monitoring MIB", RFC1566, January
1994.

[12] Kille, S., "Mapping between X.400(1988) / ISO 10021 and RFC
822", RFC1327, May 1992.

[13] Crocker, D., "Standard for the Format of ARPA Internet Text
Message", RFC822, August 1982.

[14] Vaudreuil, G., "Enhanced Mail System Status Codes", RFC1893,
January 1996.

10. Security Considerations

This MIB does not offer write access, and as such cannot be used to
actively attack a system. However, this MIB does provide passive
information about the existance, 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.

11. Author and Chair Addresses

Ned Freed
Innosoft International, Inc.
1050 Lakes Drive
West Covina, CA 91790
USA

Phone: +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

Phone: +44 181 332 9091
EMail: S.Kille@isode.com

12. Full Copyright Statement

Copyright (C) The Internet Society (1998). 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 FITNESS FOR A PARTICULAR PURPOSE.