tracking emails

Hi, Been searching for this topic on google, hotscripts and in the archives. I see that this has been discussed a bit in the archives so here goes: Problem: After sending the newsletter try to "see" how many people have actually opened the email. Solutions presented (from the archive): Ask for reciept (Problem: hotmail, yahoo ignores this) Send as html and call a script via a <img> tag passing the member id (Problem: html messages is usually off) Ask user to "kindly" click here to confirm they have recieved the email (Problem: does not work, just pisses them off) Thats what I found so far, is there something I missed or any particlar way YOU do it? Thanks, -Ryan A