Office 365, Email, Exchange, How do I view mail headers?

How can I get Header information in Microsoft Exchange?

To access Internet Mail Header information for an email:

  1. Open a browser.
  2. Log in to the Outlook Web App at https://outlook.office365.com.
  3. Locate the message for which you want information.
  4. Click the More actions (...) button next to the reply and forward buttons, then select View > View message details. 
  5. The Message details box contains the Internet Mail Headers information.