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SMTP; Hop count exceeded - possible mail loop detected on message id RRS feed

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    When anyone is sending email to any incorrect email address then instead of sending NDR that "The email address you entered couldn't be found. Please check the recipient's email address and try to resend the message. If the problem continues, please contact your email admin." server is responding with below NDR.

    A problem occurred during the delivery of your message likely due to a bad mail routing configuration. This could be a temporary situation. Please try to resend the message later. If the problem continues, contact your email admin.

    <fqdn of server> gave this error:

    SMTP; Hop count exceeded - possible mail loop detected on message id <MessageID@domain.extension>

    We are in hybrid with O365. Other accepted domains in this mail server are behaving as expected. Issue is occurring even when an OnPrem user is sending email to incorrect email address.

    Thanks, Rishi Pandit.

    Friday, May 11, 2018 1:34 PM

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    Hi,

    As per my knowledge, if the ExternalEmailAddress mail user attribute in O365 is not correct, we may get the NDR message, and this online attribute is synced from the TargetAddress attribute in Exchange on-premise.

    We could get the fix in the following blog: Hop Count Exceeded – Possible Mail Loop.

    Hope it helps.

    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    • Proposed as answer by Manu Meng Tuesday, May 15, 2018 9:47 AM
    • Unproposed as answer by Rishi Pandit Wednesday, May 16, 2018 7:31 AM
    Monday, May 14, 2018 6:47 AM
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    Hi Manu,

    I am not facing any issue with existing email addresses. Issue is occurring for non-existing email address like jfdiowffdknfs@mydomain.com (incase of typo - like if my id is rishi.pandit@mydomain.com and someone sends email to rishipandit@mydomain.com - A non existing email address)

    Thanks, Rishi Pandit.

    Wednesday, May 16, 2018 7:35 AM
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    Hi,

    Sorry for the delay, just one thing confirm with you:

    "Issue is occurring even when an OnPrem user is sending email to incorrect email address."

    If the mailbox is also an on-premise mailbox or a O365 mailbox?

    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Monday, May 21, 2018 2:41 AM
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    Yes, the users having mailbox onprem itself are also facing same issue. I am having 3 more accepted domains in the same exchange setup and these domain are giving proper NDR message for non-existing email addresses.

    Thanks, Rishi Pandit.

    Monday, May 21, 2018 6:04 AM
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    Hi,

    Would you please send the message tracking log here?

    Get-MessageTrackingLog -Sender "sender address" -Recipients "recipients address" -MessageSubject "subject" | fl


    Regards,

    Manu Meng

    Please remember to mark the replies as answers if they helped. If you have feedback for TechNet Subscriber Support, contact tnsf@microsoft.com.

    Click here to learn more. Visit the dedicated forum to share, explore and talk to experts about Microsoft Teams.

    Tuesday, May 22, 2018 8:55 AM
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    [PS] C:\Windows\system32>Get-MessageTrackingLog -Sender "idadmin.onprim@impetus.co.in" -Recipients "jkfnfdk@impetus.co.in" -MessageSubject "6:50 PM" | fl


    RunspaceId              : 354a5efd-3178-4203-ac01-478f313a2593
    Timestamp               : 11-05-2018 18:50:23
    ClientIp                : fe80::39b9:321a:d003:50ef
    ClientHostname          : MBX1.impetus.co.in
    ServerIp                : fe80::39b9:321a:d003:50ef%15
    ServerHostname          : MBX1
    SourceContext           : MDB:8a2807e6-e345-4c14-b309-c31f83673a70, Mailbox:d9789a67-1b9d-4763-9038-625a48017d39, Event:7089862, MessageClass:IPM.Note,
                              CreationTime:2018-05-11T13:20:23.599Z, ClientType:OWA, SubmissionAssistant:MailboxTransportSubmissionEmailAssistant,
                              ServerMdbConnectionId:08D5B3437F22532E
    ConnectorId             :
    Source                  : STOREDRIVER
    EventId                 : RECEIVE
    InternalMessageId       : 7690
    MessageId               : <5aa0e10381c94c6ca18cc95d6fe815c3@impetus.co.in>
    NetworkMessageId        : 91eeb342-67ac-444d-afc8-08d5b741f3f8
    Recipients              : {jkfnfdk@impetus.co.in}
    RecipientStatus         : {To}
    TotalBytes              : 6176
    RecipientCount          : 1
    RelatedRecipientAddress :
    Reference               :
    MessageSubject          : 6:50 PM
    Sender                  : idadmin.onprim@impetus.co.in
    ReturnPath              : idadmin.onprim@impetus.co.in
    Directionality          : Originating
    TenantId                :
    OriginalClientIp        : 192.168.100.166
    MessageInfo             : 04I:
    MessageLatency          :
    MessageLatencyType      : None
    EventData               : {[MailboxDatabaseGuid, 8a2807e6-e345-4c14-b309-c31f83673a70], [ItemEntryId, 00-00-00-00-4E-2F-8C-37-96-F2-E4-4D-B8-96-B4-AF-BE-AC-86-39-07-00-0D-
                              2B-25-C6-97-EA-9E-4B-AC-E6-74-89-50-C3-32-91-00-00-00-00-01-0F-00-00-0D-2B-25-C6-97-EA-9E-4B-AC-E6-74-89-50-C3-32-91-00-00-AA-23-66-25-00-00],
                              [DeliveryPriority, Normal], [AccountForest, impetus.co.in]}
    TransportTrafficType    : Email
    SchemaVersion           : 15.01.1261.035

    RunspaceId              : 354a5efd-3178-4203-ac01-478f313a2593
    Timestamp               : 11-05-2018 18:50:23
    ClientIp                : fe80::39b9:321a:d003:50ef%15
    ClientHostname          : MBX1
    ServerIp                :
    ServerHostname          : MBX2.impetus.co.in
    SourceContext           : MDB:8a2807e6-e345-4c14-b309-c31f83673a70, Mailbox:d9789a67-1b9d-4763-9038-625a48017d39, Event:7089862, MessageClass:IPM.Note,
                              CreationTime:2018-05-11T13:20:23.599Z, ClientType:OWA, SubmissionAssistant:MailboxTransportSubmissionEmailAssistant
    ConnectorId             :
    Source                  : STOREDRIVER
    EventId                 : SUBMIT
    InternalMessageId       :
    MessageId               : <5aa0e10381c94c6ca18cc95d6fe815c3@impetus.co.in>
    NetworkMessageId        : 91eeb342-67ac-444d-afc8-08d5b741f3f8
    Recipients              : {jkfnfdk@impetus.co.in}
    RecipientStatus         : {}
    TotalBytes              :
    RecipientCount          : 1
    RelatedRecipientAddress :
    Reference               :
    MessageSubject          : 6:50 PM
    Sender                  : idadmin.onprim@impetus.co.in
    ReturnPath              :
    Directionality          : Originating
    TenantId                :
    OriginalClientIp        : 192.168.100.166
    MessageInfo             : 2018-05-11T13:20:23.599Z;LSRV=MBX1.impetus.co.in:TOTAL-SUB=0.332|SA=0.032|MTSS=0.299(MTSSD=0.299(MTSSDA=0.006|MTSSDC=0.008|SDSSO=0.195(SMSC=0.030
                              |SMS=0.164)|X-MTSSDPL=0.019|X-MTSSDSS=0.031|MTSSDSDS=0.001))
    MessageLatency          : 00:00:00.3320000
    MessageLatencyType      : LocalServer
    EventData               : {[ItemEntryId, 00-00-00-00-4E-2F-8C-37-96-F2-E4-4D-B8-96-B4-AF-BE-AC-86-39-07-00-0D-2B-25-C6-97-EA-9E-4B-AC-E6-74-89-50-C3-32-91-00-00-00-00-01-0
                              F-00-00-0D-2B-25-C6-97-EA-9E-4B-AC-E6-74-89-50-C3-32-91-00-00-AA-23-66-25-00-00], [DeliveryPriority, Normal]}
    TransportTrafficType    : Email
    SchemaVersion           : 15.01.1261.035

    RunspaceId              : 354a5efd-3178-4203-ac01-478f313a2593
    Timestamp               : 11-05-2018 18:50:23
    ClientIp                :
    ClientHostname          : mbx2.impetus.co.in
    ServerIp                :
    ServerHostname          : MBX1
    SourceContext           : d0af2020-302c-4c28-a614-fbb2cb3593d7
    ConnectorId             :
    Source                  : SMTP
    EventId                 : HARECEIVE
    InternalMessageId       : 42803644072319
    MessageId               : <5aa0e10381c94c6ca18cc95d6fe815c3@impetus.co.in>
    NetworkMessageId        : 91eeb342-67ac-444d-afc8-08d5b741f3f8
    Recipients              : {jkfnfdk@impetus.co.in}
    RecipientStatus         : {}
    TotalBytes              : 7079
    RecipientCount          : 1
    RelatedRecipientAddress :
    Reference               :
    MessageSubject          : 6:50 PM
    Sender                  : idadmin.onprim@impetus.co.in
    ReturnPath              : idadmin.onprim@impetus.co.in
    Directionality          : Originating
    TenantId                :
    OriginalClientIp        :
    MessageInfo             :
    MessageLatency          :
    MessageLatencyType      : None
    EventData               : {[DeliveryPriority, Low], [PrioritizationReason, ShadowRedundancy], [AccountForest, impetus.co.in]}
    TransportTrafficType    : Email
    SchemaVersion           : 15.01.1261.035

    RunspaceId              : 354a5efd-3178-4203-ac01-478f313a2593
    Timestamp               : 13-05-2018 18:51:12
    ClientIp                :
    ClientHostname          :
    ServerIp                :
    ServerHostname          : MBX1
    SourceContext           : Expired;d0af2020-302c-4c28-a614-fbb2cb3593d7
    ConnectorId             :
    Source                  : SMTP
    EventId                 : HADISCARD
    InternalMessageId       : 42803644072319
    MessageId               : <5aa0e10381c94c6ca18cc95d6fe815c3@impetus.co.in>
    NetworkMessageId        : 91eeb342-67ac-444d-afc8-08d5b741f3f8
    Recipients              : {jkfnfdk@impetus.co.in}
    RecipientStatus         : {}
    TotalBytes              : 7079
    RecipientCount          : 1
    RelatedRecipientAddress :
    Reference               :
    MessageSubject          : 6:50 PM
    Sender                  : idadmin.onprim@impetus.co.in
    ReturnPath              : idadmin.onprim@impetus.co.in
    Directionality          : Originating
    TenantId                :
    OriginalClientIp        :
    MessageInfo             :
    MessageLatency          :
    MessageLatencyType      : None
    EventData               : {[DeliveryPriority, Low], [PrioritizationReason, ShadowRedundancy], [AccountForest, impetus.co.in]}
    TransportTrafficType    : Email
    SchemaVersion           : 15.01.1261.035



    [PS] C:\Windows\system32>

    Thanks, Rishi Pandit.

    Wednesday, May 23, 2018 9:19 AM
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    Hi,

    The log is here. Any views?

    Thanks, Rishi Pandit.

    Tuesday, June 12, 2018 5:38 AM