How to tell where an email really comes from?

I am using Outlook Express.  I am getting emails from someone with @hotmail.com as the domain of the email address.   I suspect that this is from another individual who is using a fictitious name.  

I then selected "view all headers" in Microsoft Outlook Express, but I saw nothing different in viewing the email...that is, no headers are showing.  Is there any way, short of the name given by the sender (which he/she picks) that I can get a better idea where this email is coming from?