Other Questions
I did send a mail to the GM, but he didn't react? 
Do OOC-mails have to have a special format?
I think player x is cheating.
I did send a mail to the GM, but he didn't react?
Even the GM has a private life and maybe is away for the weekend; be patient for a few days. If you haven't received anything after that, contact me again, sometimes even e-mail get lost.
Do OOC-mails have to have a special format?
The last line of your mail should make clear who you are. For example:
John Doe / Tron
I think player x is cheating.
Mail what you observed to karl@frank.name.
I am not tolerating any cheating. If I find out that someone is hacking the website for procedures or the like, he will be kicked from the game. I also keep the right to inform other GMs and ISPs (Internet Service Providers) of such attempts.
