Add this plugin please:
https://www.spigotmc.org/resources/saynotomcleaks.40906/
Description:
This plugin block Alt Account System same as McLeaks or AltDispenser.
SayNoToMcLeaks uses MojangAPI to check IP Authentication on Minecraft.net and on your server.
If the result doesnt the same, the plugin execute custom commands (Editable on config file).
How it works with Legal account:
[Blocked Image: https://proxy.spigotmc.org/720973bd9aafeda6d92c296a18846ef9bc878009?url=http%3A%2F%2Fevercraft.fr%2Fimages%2FClientSafe.png]
And with stolen account:
[Blocked Image: https://proxy.spigotmc.org/6ff327739e2e7e2abb9c22d9b7a5d9341b488403?url=http%3A%2F%2Fevercraft.fr%2Fimages%2FClientNoSafe.png]
