You should probably add this to the server for those pesky IP spammers, etc. Link to the plugin: https://mods.curse.com/bukkit-plugins/minecraft/antiad The features just in-case you do not want to click the link as soon as you look at the suggestion. :3 Stop IP/URL on Sign. Blocks spam (Large words, and Caps) Detects Nicknames Config file with lots of configurable options Implemented permissions Customizable ban and non-ban messages Recognises websites and blocks them 3 Warnings before action Separate actions for spam and advertising, fully configurable It also blocks URLs even if typed badly and prevents Spam. Logging the spam and the advertising in the log.txt Stealth mode so the players are not aware of Anti Alternatively you could try and use Advanced AntiSpam instead. Link to the plugin: https://mods.curse.com/bukkit-plugins/minecraft/antiad Features: AntiSpam for chat AntiSpam for commands AntiCaps Word BlackList Command BlackList GlobalMute AntiAD IP AntiAD URL/Website Join/Leave messages Essentially the same but may work better and seems to look nicer than the listed plugin above.