EXAMPLE:
Type in chat, /pm and you see new or old messages from players, and see your sending messages.
How to sends messages?
Type in chat, /pm "PLAYER NAME"
When send message, but not good write player name.
[PM] Player "PLAYER NAME' not found!
When you send message.
[PM] Message complete sending!
When player, get message from you.
[PM] You have message!
I think is good idea
Make it!
[MY BAD ENGLISH]