Not all email you receive can be trusted. Viewing full message headers allows you to see where messages originate. This information is often required in order to help locate the source of spam or other specific email issues.
- Start Outlook.
- Double-click the message whose headers you wish to view
- Click Options (2007) or Tags (2010/2013).
The Message Options dialog box is displayed. The internet headers are shown in the Internet headers field at the bottom of the dialog box.