Finding the Sender of an Email Message in Microsoft Outlook
Have you ever received spam . . . from yourself?? I have! Here's how you found out who really sent the email message without opening the email.
Right-click the message in your message list, and choose Options. In there, you'll be able to find an email address that you probably don't recognize. Just look for it in the Internet headers box, as shown in the graphic below. This one is an email from me to me--