I have never done this but have a look at his site and see if it helps http://www.abika.com/Reports/traceemails.htm There are programs which offer to do this eg E-mail Tracing Wizard, but if you read the fine print it only tells you how to do it so don't go plunking down over $60 and still can't accomplish what you want. No saying you should buy this but have a look at this site http://www.emailtrackerpro.com/support/faq.html
Thanks Jamz. I went snooping around google and got an education on email headers and IP's. Used a trail version of the tracker program and accomplished the task.
OK I confess!, you got me!. I promise not to send you anymore spam Glad to know that you got it sorted out. Cheers.