Mark email as opened only if opened by recipient
Currently if sender open email in sent it is marked as opened.
I need this to proof that email was delivered and opened by recipient.
And, by the way, return IP of recipient along with date and time.
Corinne SCAGLIOLA commented
On the same topic, I would like the marker to NOT say "OPEN" when receiving an automatic absence message. In this case the email is indeed not open yet by the receiver.
That would be totally useful. I just wanted to submit this idea.