Displaying Full Message Headers in Microsoft Outlook (Windows
Not all email you receive can be trusted. Viewing full message headers allows you to see where messages originate. This information is often needed by security and support specialists to help locate the source of spam or other specific email issues.
1. Double-click the email message to display it in its own full window.
2. Select “File” > “Properties“
3. The Properties window is displayed. View the message header in the “Internet headers” field at the bottom of the window.