OIT Home > OIT Knowledge Base Search Knowledge Base: How do I view and send the full headers of an email message in macOS Mail? To forward an email with full headers in the Mail application on a Mac, please follow the instructions below. With the Mail application open: Click on the message for which you want to see the full header information. Click the View on the menu, and then choose Message and Long Headers, OR press Command-Shift-H on the keyboard. Click the Forward button, OR click the Message on the menu and choose Forward Message, OR press Command-Shift-F on the keyboard. Fill in the address in the "To:" field as well as the subject. If forwarding the headers to the OIT Abuse Team, send them to email@example.com. Then, proceed to send the message as normal. Please note that the Mail application support is best effort. Need more help?