In MS Outlook, to view the "Internet Header" source, you need to be in the Messaging Options dialog for that e-mail/message,
1. Highlight the desired message in your In-box or other folder.
2. Right click, you should see the option Message Option ...
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3. In the Message Options dialog, look for the Internet headers section.
The Received lines of text contain the breadcrumbs of how this message got to you.
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