I've seen a lot of posters recently saying their friends have been banned with no warning and no response to emails asking why.
It seems unfair and creates more speculation and frustration than a less opaque system does. Would it be possible to create a new form for banning, to be sent to the bannee from MNHQ, with a brief 'this is what you did wrong', this is how long you're banned for, this is how we want to resolve it' message? I have seen it done on other forums so it's not that outlandish a request, I hope.