Currently, there is only the ability to provide the "Full" permissions to users for the "System Messages" module. This means that in order for users to be able to read the messages they have been sent, they also need the "Full" permissions; however, as a result of this, they are then allowed to send messages freely too.
There are quite a few scenarios (similar to an all staff type email distribution lists), where we'd want users to receive/read messages, but only allow a set few to be able to send messages. By allowing everyone the ability to send messages, as it currently stands, there is no control over what is being sent.
