There aren't many rules. This is a fuck off/you message service after all so saying that to someone this way would fit this service very well.
But, this service does not condone any form of telling/wishing someone to die, kill or do harm to themselves or others.
For this reason, ip addresses are saved and if any message is found which breaks those rules, it will be removed without warning.
Also, if you wish for someone to die/hurt/harm themselves or others, that kind of stuff is not a joke, don't fucking do that.
Last but not least, this is a fuck off message service, the sentence or word you want to deliver to someone *HAS* to contain the word "fuck".
Allowed characters: lowercase/uppercase a-z, 0-9 and these characters: '"-!? (and also spaces)