err, instead of doing all that, just look in your headers. All services provide headers from origination to all the hops it takes to get to your destination. Just look at the options menu, and show all headers. If you use hotmail click options on top right, click message display and click advanced on headers. yahoo should have the same way. it will show you Xoriginating IP. Take that IP, go to arin.net, and put that IP on search WHOIS, it should give you all the info you need.