Rule # 1 : Any modifications which give you some kind of advantage over other players are FORBIDDEN. An exception is made for Optifine and similar modifications.
Rule # 2: Abuse of bugs (item duplication, 0-tick farms etc.) and any attempt to overload or crash the server is strictly FORBIDDEN. Whenever you find a bug, you should report it to the staff immediately (you will receive rewards if the reported bug is of serious nature).
Rule # 3: Insults, swearing, threats, unnecessary disputes and any attempt to create tension are FORBIDDEN. Always keep a good tone in the server and maintain a friendly environment. Writing in CAPS is considered as shouting, and the staff is entitled to mute you if they feel you are creating tension. If someone has offended you, report it instead of insulting back the person.
Rule # 4: All racist, discriminatory, and pornographic content is FORBIDDEN .
Rule # 5: Spamming is FORBIDDEN, that is, writing the same things in a chat several times in a row or at a specified time interval.