Request a 'Delivery Notification'

eI already have the ability to request a read receipt from the recipient when sending an email. These require interaction with the recipient. In many cases, for the sender it would be sufficient to have a 'delivery notification' - this is sent by the receiving server and will not bother the the recipient.

Expected

• Add a button (like 'request read receipt') that will add the request for 'Delivery Notification'
• The RCPT TO: header should be updated to read: "RCPT TO:<recipient@remote> NOTIFY=SUCCESS,FAILURE,DELAY ORCPT=rfc822;<FROM ADDRESS>"

Note
The receiving server can be configured to not send the delivery confirmation, so enabling the Delivery notification is no guarantee.