There are two ways to view full message headers in Outlook-
1st option
- Double click the email message to display it in its own full window
- Select File > Properties
- Properties window is displayed. View the message header in the Internet headers field at the bottom of the window.
2nd option
- Double click the email message to display it in its own full window.
- Select the arrow in the tags section
- The properties window is displayed. View the message header in the Internet headers field at the bottom of the window.