FreedomChat

FreedomChat – Disable Chat Signing Server-Side

| NOTE: If you wish to allow players using client mods disabling chat signing to join your server, you must also disable enforce-secure-profiles in server.properties in addition to installing this plugin.

Out of the box, FreedomChat only rewrites outgoing messages and does not modify the signature checking messages for incoming messages.
Doing this mitigates compatibility issues caused by chat signing, and in the process prevents players from reporting each other, but does not allow players using client-side mods disabling chat signing to join.|
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The Definitive Chat Report Disabler

FreedomChat is a very simple plugin that makes player chat unreportable. FreedomChat completely disables chat reporting server-side for 1.19+ without other negative consequences and maximum compatibility.

Installation

Installing this plugin is very simple. Just download it and put it in your plugins folder.

If you get an error when the plugin is enabling or when the players are joining, you have likely downloaded the wrong version! Each Minecraft version has its own plugin version.