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Issue when sending email to a mail enabled security group RRS feed

  • Question

  • Hello

    We have Exchange Server 2013 in our environment.I had created a mail enabled secuirty group.Inside this groups are few other mail enabled security groups. Basically a group was created with nested groups. There are altogether around 60 users within this group from different databases.

    When an email was sent to this group, only 13 users received the email. For others mail delivery failed without any NDR to sender.The email was delivered to 13 random users within the group from different databases.

    Kindly suggest me if anyone has faced similar issue and how should I resolve this.

    ThankYou

    Saturday, June 29, 2019 12:20 PM

All replies

  • Are the nested groups mail-enabled?

    Ed Crowley MVP "There are seldom good technological solutions to behavioral problems."
    Celebrating 20 years of providing Exchange peer support!

    Saturday, June 29, 2019 2:18 PM
    Moderator
  • Hello

    Yes the nested groups are also mail enabled.

    Sunday, June 30, 2019 6:29 AM
  • Hi,

    Are these 13 users members of nested groups?

    How many Exchange servers do you have?

    If some group members are on the other Exchange servers in your environment, please check and configure the maximum number of connections that the Receive connector serves at the same time from a single IP address:

    Get-ReceiveConnector -server <server name>|fl Identity,MaxInboundConnectionPerSource Set-receiveconnector -Identity <ReceiveConnectorIdParameter> -MaxInboundConnectionPerSource 200

    You can check the message tracking log to verify where the message is blocked:

    Get-MessageTrackingLog -sender <user address> -recipient <user address> -MessageSubject <subject> | select timestamp,EventID,Source,SourceContext,ConnectorID,sender,recipients,messagesubject

    You can check this for more information about Event types in the message tracking log 

    Regards,

    Lydia Zhou


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    Monday, July 1, 2019 6:59 AM
    Moderator
  • Dera Lydai

    Thanks for the response.

    Will try this and get back to you.

    Monday, July 1, 2019 12:49 PM
  • Hello Lydia

    I ran the command you provided in shell, following is the output:

    Is client proxy the value you are suggesting to change?


    • Edited by Avi Yadav Tuesday, July 2, 2019 1:38 PM
    Tuesday, July 2, 2019 1:37 PM
  • Do you have multiple domains?
    Is the created DL local, global or universal?


    Tuesday, July 2, 2019 1:48 PM
  • Hi,

    For internal messages, "Default <servername>" receive connector will be used to receive emails from other mailbox server in the environment. From the screenshot above, if this message was sent from internal user and "Default <servername>" of all other mailbox servers have the same settings for MaxInboundConnectionPerSource, you don't have to worry the receive connector.

    More details will be helpful to troubleshoot. How may Exchange servers in your environment? What roles did you deploy? Was this message sent from a user inside the organization?

    You can check the message tracking log for some members who don't receive the message.

    Check queues from Queue Viewer, make sure no message is blocked in the queue.

    Don't forget to check transport rules, make sure no emails will be deleted without notifying.

    As DumbleD0re mentioned, verify if these groups are universal groups.

    Regards,

    Lydia Zhou


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    Wednesday, July 3, 2019 9:13 AM
    Moderator
  • Hello

    Yes, the message was sent from internal user. The settings for all mailbox servers are same as in the screenshot.

    We have Exchange 2010 and 2013 in coexistence mode. 

    Exchange 2010 - 3 Mailbox,2 Hub

    Exchange 2013 - 2 Mailbox,1 Hub

    Exchange Edge - 2 Servers

    I checked the message tracking log,there was no failure log for members who did not receive the email.Also no emails in queue.

    There are no transport rules to delete emails without notifying.

    All  the groups are universal mail enabled security groups.

    Thursday, July 4, 2019 9:43 AM
  • Are all the nested groups and members visible in outlook when you try to resolve and expand the parent mail enabled security group?
    Thursday, July 4, 2019 10:13 AM
  • Hi,

    You can use the command to check the event types of message tracking logs. The event type and SourceContext will tell you after which step the message is missing. For example, the DROP event means a message was dropped without a delivery status notification. You should check the message tracking logs on all Hub and mailbox servers.

    Regards,

    Lydia Zhou


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    Monday, July 8, 2019 10:07 AM
    Moderator