I got banned for x-ray hacking.
I assume this was an auto ban for mining too many diamond ore blocks within an short period of time at a too low level. As I read, other players have been banned for the same reason.
What I did:
At the area of x=-1780 y=6 z=-4440 I placed 38 silk touched diamond ore blocks, along with some coal and redstone ore blocks in order to mine them with a regular pickaxe. I didn't x-ray anything nor I violated any other server rules. You can still see some of my diamond ore blocks on the map because this area is open to the sky.
Therefore I hereby ask for being unbanned.