NethServer v7.3 GUI: Status → Services → postfix (SMTP) → Restart button.
NethServer v7.3 CLI: # systemctl restart postfix.service
- On SOGo: You don’t have “request DSN” option in web GUI (only “Return Receipt”). Same for WebTop 5 ( Mail: receipt button ).
- On Thunderbird: This addon is for set permanently Request DSN.
Without addon, you can ask for DSN for each email that you want to send, from here: Write → Option → Delivery Status Notification. - On Outlook 2013:
Permanently: FILE → Option → Mail → Tracking: Enable “Delivery receipt confirming the message was delivered to the recipient’s e-mail server”.
For each email that you want to send: New Email → OPTIONS → Enable " Request a Delivery Receipt".