I have added this to our feature request list for further consideration by the dev team.

Is there any news for this feature? Customers that I have migrated from Mailenable, Kerio Connect and MS Exchange are all complaining about this lack ...

 

Came here to request this, glad to see someone else needs it. We have a client that came from Kerio to SM and is asking for this feature.

Delivery receipts are slated for inclusion in SmarterMail 17.

In Build 6911 (Dec 3, 2018) we added a user account setting for "Request delivery receipts by default". When this is enabled, the user will receive a delivery receipt that verifies the delivery status for all outgoing messages sent via webmail and email clients. 

When composing a message in webmail, the delivery receipt request can be disabled for that individual message by using the Actions (...) button on the compose window.