How to See Full Email Headers in

How to see more information in email headers in

Hands typing on a laptop with a cookie and coffee beside them


In, you can get access to the full email header information.

Why Examine Email Header Lines?

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, it is important to see the mail's full headers.

By default, show only a few important headers, but you can make it display all header lines.

Instructions in this article apply to Outlook Online.

See Full Email Headers in

To get access to full message headers in

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

    An email from website
  2. Click More actions which is denoted as 3 dots (...).

    More actions is highlighted in email
  3. Select View message source from the menu that has appeared.

    Viewing other actions in
  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. Select Close once you've finished viewing the header.

    Viewing the full header info for an email in

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