In the reports plugin it adds one command that allows players to report other players.
/report [who they want to report] [there email]
When they report the player they will get messages containing there case number, and the servers report email (the email they want to use to talk about the reports). Their will then be a file in the plugins data folder that has the case number as the name, in the file it will hold the case number, the reporters name, the reporters email, and the person that they want to report.
This plugin is still in early development so any feedback is great!