Email message headers provide a list of technical details about the message, such as who sent it, the software used to compose it, and the email servers that it passed through on its way to the recipient. This information is often needed to help locate the source of spam or other specific email issues.

You can display full headers by double clicking on a message so that it opens in a separate window (not the preview pane).

  1. Start Outlook.
  2. Double-click the message for which you want to view full internet headers.
  3. Click Options (2007) or Tags (2010/2013).

    message options button / 

  4. The Message Options dialog box is displayed. The internet headers are shown in the Internet headers field at the bottom of the dialog box.