Has anyone had any success using one of the "e-mail address finders". Such as TheEmailFinder.com? or something similar. Similar sites also offer a "reverse" tracking system. One suggestion was to go to the website of the relevant isp, but you can only look up addresses if you are already on that isp (I think). Any helpful suggestions will be gratefully received. Some "finders" charge a fee, which I do not mind as it seems to be a one-off fee.