Follow these instructions to forward full headers in Apple Mail.

1. Launch Apple Mail application.

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2. Open the email in question, so we may get to the message's headers.
3. Go to the "View" menu, select the "Message" sub-menu, and select the "Raw Source" option.

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4. A new window will appear with all the Raw Email Source information, from here press the Select All keyboard combination, to select all of the Raw Source information: Command (⌘)-A

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5. Now press the Copy keyboard combination, to copy the selected Raw Source: Command (⌘)-C
6. Going back to the email message, click the Forward button:

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7. Now, within the Forward message editor, press the Paste keyboard combination, to paste the copied Raw Source: Command (⌘)-V

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8. Now enter the recipient's (To) address and Send the email message.
   • SPAM message, typically send to: abuse@fsu.edu

For more information on Apple Keyboard Combinations, check out Apple's Support Page: https://support.apple.com/en-us/HT201236