How to See Full Email Headers in Outlook.com

How to see more information in email headers in Outlook.com

When you want to trace spam to its source and report the spam to the internet service provider, or when you need to to see mailing list commands hidden in header lines, view the full headers for the message. By default, Outlook.com shows only a few important headers, but you can make it display all header lines.

Instructions in this article apply to Outlook.com and Outlook Online.

See Full Email Headers in Outlook.com

To access the full message headers in Outlook.com:

  1. Open the message whose headers you want to examine.

    An email from Outlook.com website
  2. Select More actions (the 3 dots ...).

    More actions is highlighted in Outlook.com email
  3. Select View message source.

    Viewing other actions in Outlook.com
  4. The header information will be at the top of the email. You'll see not only the header information but HTML formatting for the email as well.

    Viewing the full header info for an email in Outlook.com
  5. Select Close when you finish viewing the header information.

What Do Email header Lines Look Like?

An email's header lines can look like the following highlighted example below:

Viewing an email header in Outlook.com