How to get complete Message Headers for Office-365 Email

How to get complete Message Headers from Outlook

Browser Based Mail (OWA)

1. 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.
6. Create a notepad file and paste all those texts into that file.

Outlook

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 under Follow Up 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.
5. Paste the contents to any text file and save it.
6. Close the Message Options window.