{[{LED=250 2.1.5 Resolver.MT.StartModeration; recipient is moderated};{MSG=};{FQDN=};{IP=};{LRT=}]}

Question

Hi. Exchange 2016, on-premise.

Client send mail to group and got error:

Timestamp               : 7/10/2024 12:53:15 PM
ClientIp                : 
ClientHostname          : MS-EX03
ServerIp                : 
ServerHostname          : 
SourceContext           : 
ConnectorId             : 
Source                  : ROUTING
EventId                 : DROP
InternalMessageId       : 205728933483655
MessageId               : <592665ceb4cd4df2b633cb63e17be854@mydomain.com>
NetworkMessageId        : 3c24f74a-7651-4e36-d6bb-08dca0c61e2f
Recipients              : {social@mydomain.com}
RecipientStatus         : {[{LED=250 2.1.5 Resolver.MT.StartModeration; recipient is moderated};{MSG=};{FQDN=};{IP=};{LRT=}]}
TotalBytes              : 24325
RecipientCount          : 1
RelatedRecipientAddress : 
Reference               : 
MessageSubject          : RE: Amazfit GTR4
Sender                  : nkurmesov@mydomain.com
ReturnPath              : nkurmesov@mydomain.com
Directionality          : Originating
TenantId                : 
OriginalClientIp        : 
MessageInfo             : 
MessageLatency          : 
MessageLatencyType      : None
EventData               : {[DeliveryPriority, Normal], [AccountForest, jetinf.jet.msk.su]}
TransportTrafficType    : Email
SchemaVersion           : 15.01.2507.039

Timestamp               : 7/10/2024 8:50:50 AM
ClientIp                : 
ClientHostname          : MS-EX02
ServerIp                : 
ServerHostname          : 
SourceContext           : 
ConnectorId             : 
Source                  : ROUTING
EventId                 : DROP
InternalMessageId       : 211162067109856
MessageId               : <5f8ae541-b3c6-4366-9eef-38bf1d648d9d@mydomain.com>
NetworkMessageId        : ad2eca9c-73cd-46dd-b657-08dca0a440e7
Recipients              : {social@mydomain.com}
RecipientStatus         : {[{LED=250 2.1.5 Resolver.MT.StartModeration; recipient is moderated};{MSG=};{FQDN=};{IP=};{LRT=}]}
TotalBytes              : 560186
RecipientCount          : 1
RelatedRecipientAddress : 
Reference               : 
MessageSubject          : Amazfit GTR4
Sender                  : nkurmesov@mydomain.com
ReturnPath              : nkurmesov@mydomain.com
Directionality          : Originating
TenantId                : 
OriginalClientIp        : 
MessageInfo             : 
MessageLatency          : 
MessageLatencyType      : None
EventData               : {[DeliveryPriority, Normal], [AccountForest, jetinf.jet.msk.su]}
TransportTrafficType    : Email
SchemaVersion           : 15.01.2507.035

Moderator accepted this mail. I cant find information about this error.

Answer 1

Hi @Андрей Михалевский,

Welcome to the Microsoft Q&A platform!

According to your description, It looks like you're dealing with a message routing issue in Exchange 2016 on-premise related to a moderated recipient. The key part of the error is "Resolver.MT.StartModeration; recipient is moderated," indicating that the recipient's mailbox or distribution group is set up for message moderation.

When an email is sent to a moderated recipient, the message is typically held until approved by an assigned moderator, which appears to be functioning correctly as you mentioned that the moderator accepted the mail.

However, for some reason, the message is being dropped with the event ID "DROP" even though moderation has been completed.

Here are a few steps you can take to troubleshoot and resolve this issue:

1. Check the moderation settings for the group social@mydomain.com. Ensure that:

• The moderators are correctly specified.
• The moderation workflow is properly configured.

You can verify these settings using the Exchange Admin Center or via PowerShell.

Get-DistributionGroup "social@mydomain.com" | Format-List DisplayName, ModerationEnabled, ModeratedBy, BypassModerationFromSendersOrMembers

2. Make sure there are no transport rules that might be affecting the messages to moderated recipients. Transport rules can sometimes cause messages to be dropped if they do not meet specific conditions.
3. If any custom transport agents are installed, they could interfere with the normal mail flow. Review and disable them temporarily for testing.
4. Check the message tracking logs to get more details on the lifecycle of the message. This can provide insights into what might be going wrong after the moderation is approved:

Get-MessageTrackingLog -MessageId "592665ceb4cd4df2b633cb63e17be854@mydomain.com" | FL

Get-MessageTrackingLog -MessageId "5f8ae541-b3c6-4366-9eef-38bf1d648d9d@mydomain.com" | FL

Please feel free to contact me if you have any queries.

Best,

Jake Zhang

Answer 2

Hi @Андрей Михалевский,

Thanks for your response.

Great to know that the issue has already been resolved and thanks for sharing the solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others", I'll repost your solution in case you'd like to "Accept" the answer : )     

--------------   

Issue Symptom: 

Exchange 2016, on-premise.

Client send mail to group and got error:

{[{LED=250 2.1.5 Resolver.MT.StartModeration; recipient is moderated};{MSG=};{FQDN=};{IP=};{LRT=}]}

Resolution: 

Please move the service box to another base.

Best,

Jake Zhang