heres some info
How Missionary Works
When players come on your server with Missionary, it has already checked and ensured that they have no cheats or files that you do not want on your server. Unlike some of the programs out there that have them come on and then throws up flags saying they have illegal files, when they may have just left in a custom gunsight, Missionary will take care of all of that before they even come on. Missionary will also let the player know before coming on if there name is not appropriate along with informing them about your server, files that they can have, and the current status. If they are on the ban list that you send it, they will not even be allowed to start Missionary to your server. You can even choose (Not Recommended) to use all of the available banned list if desired. (I believe it is only important to stop cheats and unwanted players from coming on the server, not making a be deal about kicking them.) Players coming on with Missionary, who do something to be banned, will also find that changing names and IPs will not be enough.