This mod is unmaintained,
as I like to procrastinate.
This mod only supports Fabric 1.16.x. More versions may be supported later in the future.
Simply download the mod and put it in your mods folder (It should be in your game directory).
This will not work on Forge.
You need Mod Menu if you want to change the message.
It sends a customizable message when you join a server.
This mod depends on Fabric API and Cloth Config. Download a version of Cloth Config for your Minecraft version here.