It's been a few weeks now and I've tried everything, with the exception of the one way it would work
The my knowledge, there isn't a way of reading the senders email address from a read receipt!
So I will need to find a way to link the read receipt with the original email sent and extract the email from the original person i sent it to. In a way that isn't to bad since I had situations where someone else opened the email! Perhaps, their server automatically forward it.
I will post a new question as i couldn't find how to "link" the two either?