New in the MediaPublisher is the possibility to see that parents have read your message. When you log in to the MediaPublisher and press a post that you have published, you can see which of your selection has already seen the post. This way you know that your message has also been received and read by your selection.
Also check out the Live Sprinter in which this update is demonstrated:
https://support.ziber.nl/hc/en/articles/360001434897-Updates-Innovations