This project is abandoned and its default file will likely not work with the most recent version of Minecraft. Whether this project is out of date or its author has marked it as abandoned, this project is no longer maintained.
HelpOP is a plugin to help your players message online staff for help! Commands:
/helpop <message> - Messages online staff <message>. It clearly states who the message is from. Permissions:
helpop.receive - Lets player see messages sent in /helpop.
You should have a permission that allows players to send messages to online staff, but other than that, I think your plugin is good and easy to use.