You may well be able to trace it at least part of the way (or all if he was dumb enough to use the laptop at his work or home Internet) by looking at the full e

You may well be able to trace it at least part of the way (or all if he was dumb enough to use the laptop at his work or home Internet) by looking at the full email headers, which usually retain the hostnames and/or IP addresses of each system it went through along the way. Including the origin IP of the laptop, indicating where it was at the time the email was sent. Who runs your email services? If it is your local ISP, they may be able to get the IP address from the logfiles, though larger companies will probably brush you off.