The Message-ID is a unique identifier assigned to every email. Support may request this ID when investigating delivery issues, NDRs, or problems with email content or signatures.
Retrieve the Message-ID via the Exchange Admin Centre
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Sign in to the Exchange Admin Center.
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Go to Mail flow > Message trace.
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Select Start a trace.
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Enter your search criteria (such as sender, recipient, date range, or subject).
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Click Search.
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From the results list, click the email you want to inspect.
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In the details panel that opens on the right, expand More information.
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The Message ID field will be displayed - copy this value and provide it to support.
Retrieve the Message-ID from Email Headers (for end users)
If you received the email yourself, you may also view the Message-ID in the message headers:
Outlook (Desktop)
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Open the email in a new window.
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Select File > Properties.
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In the Internet headers section, locate the line starting with
Message-ID:.
Outlook on the Web
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Open the email.
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Select More actions (…) > View > View message details.
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Search the header text for
Message-ID:.
