Learn to Easily to 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 boring information such as which server picked up the message and true origin of an email message—particularly helpful for identifying spam. Viewing header lines is useful in some advanced troubleshooting cases.

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

View All Message Headers in Outlook 2016, 2013, and 2010

The process for viewing the full message headers in Outlook for Office 365, Outlook 2016, Outlook 2013, and Outlook 2010 on a PC is the same.

  1. Double-click the email message to open it in a separate window.
  2. Click File > Properties
  3. Look in the Internet headers box for the header information.
  4. Copy the header information by pressing Ctrl+C and paste it into Notepad or another text editor.

Outlook for Office 365 works in the same way.

View All Message Headers in Outlook 2007

To have Outlook 2007 show all of a message's header lines:

  1. Double-click the email message to open it in a separate window.
  2. Make sure the Message ribbon is active and expanded.
  3. Click the expansion button in the lower right corner of the ribbon's Tags section. The section, by default, holds the Follow Up and Mark as Unread buttons. In Outlook 2007, the section is labeled Options.
  4. Find the headers under Internet headers.

As an alternative, you can use the message's File menu

  1. Double-click the email message to open it in a separate window
  2. Click File.
  3. Make sure the Info category is open.
  4. Click Properties.
  5. Find the message's full header lines under Internet headers.

View All Message Headers in Outlook 2000, 2002, and 2003

To display all of a message's header lines in Outlook 2000 to Outlook 2003:

  1. Open the message in a new window in Outlook.
  2. Select View > Options from the message's menu.

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.
  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.

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