include a nasty vbs virus that says click here to confirm that you received this email. Then when the virus infects his whole company and he gets fired and calls you up all pissed off, you'll know he got the email.
That have *half* enough of a clue to be able to figure out that his e-mail caused it?<BR><BR>By your method....Maybe four out of every million recipients would be marked as capable of receiving HTML mail. :-)
Ok how about we dynamically create the vbs file with a message embedded in it like, email@example.com (insert correct email very important) has stupidly infected you company with another pointless vb script virus. Hold on to you hats people this one not only emails all your co workers but also reveals all you infidelities to your loved ones. Have a nice day!! <BR><BR>That should get him fired right? And then comes the phone call problem solved. <BR><BR>I am the master programmer.<BR><BR><BR>not <snicker><BR><BR>