I haven't looked at the tutorial, so this may be redundant...But you need to be able to view the header in order to attempt to trace an email...The means to do that varies with how you are viewing your messages...There should be an originating IP address in there somewhere....

However, just because that's what it says, doesn't mean that's really where it's from....SMTP servers can be fooled into thinking that a message is being forwarded from a different IP address than the one it is actually coming from...

Caskethopper