What do ChatManager?
Whit ChatManageryou can change or disable the join and leave messages.
You can change the permissions, so you can decide, all group messagess.
Comment: User off, to turn of a join message
Comment2: You can change the messages and the permissions
JoinMessage: '&4%Player% &6Joined the game'
LeaveMessage: '&4%Player% &6Is offline now'
JoinMessage: '&c%Player% &6Joined the game'
JoinMessage: '&a%Player% &6Joined the game'
JoinMessage: '&6%Player% &6Joined the game'
NoChatPer: '&cYou can''t speak now'
Player: '&cThe chat was muted by &6%Player%'
Other: '&cThe chat was muted'
Player: '&cThe chat was unmuted by &6%Player%'
Other: '&cThe chat was unmuted'
I hope you enjoy this.