We have partnered with a third party for indirect access to their own email subscriber database as an advertising partnership. We are creating the HTML email, and they are submitting it to their subscriber base. I want a way to independently audit that email so that I can get notified, when a copy of that message is opened... and have the report back function report the email address of each receiver back to me so that I can independently verify that they did what they said they would do. what are my options to accomplish this bearing in mind that I will not have direct access to the actual email addresses to modify them in such a way that a third party service like banana tag would be able to handle this. if there is a way to make this work with banana tag I would love to know, but as far as i can see the trackback code has to be encapsulated in my Email HTML document that I am giving to the advertising partner.