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How do I view and send the full headers of an email message in macOS Mail?

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To forward an email with full headers in the Mail application on a Mac, please follow the instructions below. With the Mail application open:

  1. Select the message for which you want to see the full header information.
  2. Select View on the menu, and then choose Message and All Headers, OR press Command-Shift-H on the keyboard.
  3. Select the Forward button, OR click the Message on the menu and choose Forward Message, OR press Command-Shift-F on the keyboard.
  4.  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
  5. Then, proceed to send the message as normal. 

Please note that the Mail application support is best effort. 

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