1. 1. Click to open the email message. 
   2. At the top right hand corner of the message, you will notice a dropdown menu arrow icon, next to the "Reply all" button. Click the dropdown menu arrow icon. 
      
   3. A menu will open, please select View message details which will appear near the bottom of the menu. 
      
   4. This will open a new popup window in the bottom right corner with the email headers for the message.
   5. 

• Next, copy the entire page of email headers.

Outlook 2016 / Outlook 2013

1. Double click on the email message so that it is opened in its own window. 
   
2. On the Message tab, in the Options section there is a little button with an arrow in it. Click on it and you have the message options menu with the internet headers in the bottom section. 
   
3. This will bring up the Message Options window. The last component of this is the Internet Headers. 
   
4. Right-click inside the headers and choose Select All, then right-click again and choose Copy.