Double-click the message to open it in a new window. In the message reading pane, click the Reply all button down arrow. The full headers will appear in a new window, simply right-click inside the headers and choose Select All, then right-click again. Click on Details (right above the To: and From: fields) and choose View Message Source.
To begin, open the email message by clicking on it. See screenshot: See screenshot: Kutools for Outlook: with more than 40 handy Outlook add-ins, free to try with no limitation in 45 days.
With the Messafe Header Analyzer utility of Kutools for Excel, you can easily view and analyze the full headers of an email in Outlook with one click. How to view sender’s email address without opening the email in Outlook?
