Delayed message issue from Outlook

Wonderwhy 171 Reputation points
2022-09-07T07:06:41.187+00:00

Exchange online one user have delayed message issue.

He sent one mail at 15:00 yesterday.

And all receivers received the delayed message at 3:40 this morning.

EAC message tracking shows this was delivered at 3:40.

Message time stamp in sender outlook shows 15:00 yesterday.

The message item was moved in his sent items automatically.

User said that sent messages including other messages are delayed.

I think it's coming from sender outlook, but there's no any NDR.

Would you please tell me the cause of root and how to investigate...?

Outlook Management
Outlook Management
Outlook: A family of Microsoft email and calendar products.Management: The act or process of organizing, handling, directing or controlling something.
4,996 questions
Microsoft Exchange Online Management
Microsoft Exchange Online Management
Microsoft Exchange Online: A Microsoft email and calendaring hosted service.Management: The act or process of organizing, handling, directing or controlling something.
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Exchange Server Management
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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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Accepted answer
  1. Joyce Shen - MSFT 16,646 Reputation points
    2022-09-08T01:31:14.183+00:00

    Hi @Wonderwhy

    Does this issue occur on internal users or external recipients or both? Is there any difference if the user send the same email from OWA rather than Outlook?
    Do all the emails sent from that user have this delayed issue?

    I would suggest you check the message header for this delayed email, copy the message header of the email into the following link, and check where the delay happened:
    https://mha.azurewebsites.net/

    Here is an article about this: https://practical365.com/how-to-read-email-message-headers/
    Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft does not guarantee the accuracy of this information.


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