The only official support options are:
DO NOT paste code directly into a group message or IRC!
Google Groups doesn’t have any syntax coloring and will malform your code.
IRC will boot you for spamming the channel.
DO paste code using an online code pasting service.
This will allow other people to see your code properly, submit alternate versions, etc…
There are no official MooTools forums.
There are a number of unofficial places where you can discuss MooTools and ask for support.