Exchange 2016 Delivery for this message is delayed for only one server in dag

Mohamed Aly 1 Reputation point

I have an issue with exchange 2016 internal only after cu20 update; when users trying sending emails it’s not received with first time; and they need to send it again and it’s received.
Modified 1:
We update to CU22 and its the same issue.
And also we have dag (mb1 & mb2)
When checked delivery reports in mail flow we found the user send the message 4 times and the results was first one delivery report no longer available
The second and third shows that it’s use mb2 and it’s still pending.
The last one it’s use mb1 and it’s delivered

Exchange Server Management
Exchange Server Management
Exchange Server: A family of Microsoft client/server messaging and collaboration software.Management: The act or process of organizing, handling, directing or controlling something.
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  1. Aaron Xue-MSFT 2,586 Reputation points Microsoft Vendor

    Hi @Mohamed Aly ,

    Could run the get-message tracking command to get the detail of the message?
    Please confirm that you have more than 10% free space on your exchange server. Mail would also stuck in the queue if the server do not have enough space.
    You could try to restart the transport service to check if the emails is released.

    I also find a similar case for you reference.
    emails pending delivery (
    In this case, Op re-created the receive connector and then solved the issue. You could also try this way to check if the issue get resolved.

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