rcmds.deafenrcmds.exempt.deafenrcmds.others.deafen/deafen toggles the state of being “deaf” on the sender or (player) if specified, so long as the sender has
rcmds.others.deafen and (player) does not have rcmds.exempt.deafen.
If a player is “deaf,” he will not receive any player chat messages, but will still receive plugin messages.
/deafen - Toggles deaf status on the sender.
/deafen Notch - Toggles deaf status on Notch.