How to Show Original Message Details (Full Headers, Text, URL, etc.) in Microsoft 365

Outlook on the web

• In the message reading pane, click the Reply all button down arrow. Then click View message details.

Outlook for Windows

1. Double-click the message to open it in a new window.
2. Click the File menu and then click the Properties button.

Outlook for Mac

• Right-click or CONTROL + click the message and then select View Source.