How to show Full Message Headers of an email in M365 OWA

M365 Outlook Web Access (OWA)

After logon OWA account at CityU web page.
Double-click the email message. You can select the three dos "..." at the top-right corner of the screen.
Select "View" → "View message details".


Then, you may view or copy Message header (FULL HEADER).


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