How to Show Full Email Headers in Mail for Mac OS X
Some users may wish to see the complete email header attached to email messages in the Mail app for Mac OS X. These long headers can reveal many details about the sender of an email message, including the origin mail servers and IP addresses, original arrival time, email alias details, and much more, making them a potentially valuable resource for some situations, particularly for users wishing to authenticate the validity of an email or mail message. Additionally, email header information can be very helpful for troubleshooting complicated email server issues.
The Mail app in Mac OS X makes it easy to display the complete email headers for mail messages, we’ll show you how to show the full header, return to the default header, and a rapid access keystroke to toggle the display of full email headers off and on quickly as needed.
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