This plugin prevents players from using enderpearls to teleport through the Nether roof.

The plugin will create a .properties for the plugin if one doesn't exist. The properties file will contain one line: "message=Don't do that!" You can change this message or remove it if you don't want your players to get a message if their teleport has been aborted.

To install this plugin, copy the plugin JAR file to your server's plugins folder.