Is it possible to see what OS someone used to send an email?

keepmeanon 21 Reputation points
2021-11-22T15:16:30.43+00:00

Our users can sign in on multiple devices but I'm trying to track the OS used to send emails. Does MS have to way to track emails per operating system or any way to identify that?

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.
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  1. Andy David - MVP 142.2K Reputation points MVP
    2021-11-22T16:18:14.837+00:00
  2. Andy David - MVP 142.2K Reputation points MVP
    2021-11-22T16:46:05.187+00:00
  3. Andy David - MVP 142.2K Reputation points MVP
    2021-11-22T17:56:57.157+00:00

    The only way I am aware of is using the security center Explorer and accessing the headers of the message:
    https://security.microsoft.com/threatexplorer

    or use Cloud App Security if you are licensed for it and view the Activity log for that user.

    You can also search the compliance logs for the "send message" event and see what that shows:

    https://learn.microsoft.com/en-us/microsoft-365/compliance/auditing-troubleshooting-scenarios?view=o365-worldwide

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  4. ChristyZhang-MSFT 20,831 Reputation points Microsoft Vendor
    2021-11-23T03:05:30.367+00:00

    Hi @keepmeanon ,

    Welcome to our forum!

    As I know, there's no such an option in Outlook client to check what OS someone used to send an email.

    However, as I know, we can check the message header(open the received message>File>Info>Properties>Inter headers) and copy the content to Word or Notepad. And the find the following information:
    X-Mailer:
    151565-4.png

    Or User-Agent:
    151566-5.png

    Both the two fields will show the version of Outlook, which can be used to identify the OS(Windows or Mac).

    Hope to help you.

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