Learn to Easily View All Message Headers in Outlook

Expanded message headers are occasionally useful

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There is little need for most people to look at the expanded version of an email message header lines. They contain information such as which server picked up the message and true origin of an email message, which is helpful for identifying spam. Viewing header lines is useful in some advanced troubleshooting cases.

These instructions apply to Outlook 2016, Outlook 2013, Outlook 2010, and Outlook for Office 365.

How Can I View All Message Headers in Outlook?

Like many other options, the ability to show these headers exists in Outlook, but it is a bit hidden.

  1. Double-click the email message to open it in a separate window.

  2. Select File > Properties.

    Screenshot of Properties on File page of message window
  3. Look in the Internet headers box for the header information.

    Screenshot showing internet headers in message properties
  4. Copy the header information by pressing Ctrl+C and paste it into Notepad or another text editor.

All header lines appear under Internet Headers at the bottom of the dialog that comes up.

View All Message Headers in Outlook for Mac

To bring up and examine all internet email header lines for a message in Outlook for Mac:

  1. In the message list, click on the message whose header lines you wish to see with the right mouse button.

  2. Select View Source from the context menu that appears.

    Screenshot of right-click menu showing View Source
  3. Find the message headers at the top of the message's full source text, which opens in TextEdit. The first empty line from the top marks the end of the internet header area.

  4. ​Close TextEdit when you are done with the header lines.