Presence subscription packets sent to the server are broadcasted to all connected users
When sending <presence to="youserver.com" type="subscribe"> from a client to the server then the presence subscription request is sent to all connected resources. The same happens no matter the type value (subscribe, subsribed, unsubscribe, unsubscribed). Instead the server needs to reject the presence subscription. When a subscribe is sent an unsubscribed is returned. For the other types nothing is returned.
Thanks to Guus der Kinderen