To know all the details on the origin of an email, we can show header (Where header in English). This tutorial explains how to do this with Outlook.com webmail, formerly Hotmail. For the Outlook software of the Office suite, read this page.
Display the header of an Outlook.com / Hotmail email
1. Log in to your Outlook.com account.
2. Open message.
3. At the top right of the email, click on Actions then View message source.
4. The information is now displayed.
Note: the option “Show header details” only shows the sender, recipient (s) and time of sending of the message, it is not the header full email.