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Show detailed headers in Mail on Mac
When you view an email message, you can show more fields in the message header, such as List-ID or Resent-From.
- Go to the Mail app  on your Mac. on your Mac.
- Choose View > Message > All Headers. 
- To view fewer header fields again, choose View > Message > Default Headers. 
You can specify additional fields to show in default headers in Viewing settings in Mail.