in our company I transferred from qmail to ZCS 7.1. Users have been however used to the option to delete emails they already sent (We use thunderbird and all the sent emails were gathered on the qmal server and in certain interval they all were sent off.)

When I transferred to ZCS users wanted this option and therefore I relay all emails from zimbra to qmail then emails are sent away. However if a user wants read receits they are received when the mail gets to our qmail server not when the email gets to the recepient.

Please is there a possibility to configure read receits so that they would be recived when the mail gets to the recepient and not when the email gets to the relay server?

Thanks for any tip