SimpleMsgPlugin

Descriotion

This plugin adds the ability to send private messages to other players. When receiving a message, the player plays the sound of gaining experience 

minecraft:entity.player.levelup

Command to send a message:

/pm <nick> <message>

Chat message example:

P.S. In the screenshot, I sent a message to myself

 You can find the source code on my GitHub or you can join my Discord