How do I view e-mail headers in Mail for Mac OS X?
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Open Mail.
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From the Mail menu, select Preferences.
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Click the Viewing icon.
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Click the arrow box on the Show header detail pop-up list and choose All.
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Close the Viewing window. The e-mail headers should now be displayed in the message.
If you intend to send these headers to another person for review, then double-click the message.
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Click the Forward button.
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Finally, fill in the To field and send the message.
Updated 4 months ago