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Lion Mail: Show header details

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Show header details in Mail

Each message you receive has a detailed “header” section that shows the route the message took on its way to you, as well as technical details about the message and sender. Your email service provider or network administrator might ask you to send them a message with complete headers when you report problems or junk mail.

If you frequently need to view all headers, add the All Headers icon to the Mail toolbar.

Customize Mail toolbars

You can create rules that perform actions based on the content of specific headers. For example, if the List-ID header contains “lists.example.com,” you could move the message to a specific folder.

Manage messages using rules

Show header details for a single message

Select the message, and then choose View > Message > All Headers.

Show header details for all messages

Choose Mail > Preferences, click Viewing, and then choose All from the “Show header detail” pop-up menu.

You can customize the fields that Mail displays in header details. Choose Custom from the “Show header detail” pop-up menu, click Add (+), type the field name, and then click OK. To remove a field, select it in the list and click Remove (-).

Last Modified: Oct 30, 2013
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