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How to View All Email Headers in Mac OS X Mail

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Want to see it all? Want to see just enough?

Email headers offer access to many an email's detail, such as its path, email program or spam filtering information. In OS X Mail, you do not have to open the full message source to access all header lines for a message.

View All Email Headers in Mac OS X Mail

To have OS X Mail display all an email message's header lines:

  • Open the message in the reading pane or its own window.
  • Select View | Message | All Headers from the menu.
    • You can also press Command-Shift-H (think "h-eaders", of course).

To revert to the message in regular display:

  • Select View | Message | All Headers again from the menu or press Command-Shift-H.

(Updated March 2013)

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