To remedy this, the IETF introduced Delivery Status Notifications (delivery receipts) and Message Disposition Notifications (return receipts); however, these are not universally deployed in production.
Para resolvelo, o IETF introduciu o Delivery Status Notification (mensaxe de entrega) e o Message Disposition Notifications (Mensaxe devolta); aínda así, non están despregados universalmente nas redes habituais.