DETAIL 1, to the left
There are many ways to inspect, view and analyze, email headers and their underlying protocols.
One simple and commonly used method is to inspect the internet properties: ~ this method may vary slightly, dependent on the system version you are using.
Double-click the email message to display it in its own full window.
1. Select “File” > “Properties“.
2. The Properties window is displayed. View the message header in the “Internet headers” field at the bottom of the window.
Alternatively, via the App: follow Detail 3 and 4 below
3. Double-click the email message to display it in its own full window.
Select the tiny arrow in the “Tags” section.
4. The Properties window is displayed. View the message header in the “Internet headers” field at the bottom of the window.