View Message Headers
Outlook for PC
Viewing message headers allows you to see all the details of a message, usually used in reporting spam messages. The instructions outlined below are for the Outlook 2016 for PC desktop application.
2. At the bottom of the File window, click Properties.
3. This will open up a new Properties window. At the bottom, there is a section called Internet headers. Here you can see the message headers and copy and paste them, if necessary. Click Close when done.