Well, I stumbles about this in a thread on the official german forums (http://forums.wow-europe.com/thread....sid=3&pageNo=1):
Some messages seem to be blocked by the server.
I tried saying something containing www.mmo-champion.com during yesterday's raid to test this and the message, despite being sent, didn't show up in anyone's chat.
A few minutes ago I tried it on 2 chars on 2 different servers and when using it in a whisper I get a red warning in my chatbox saying:
"Unable to send chat to <name> because your message contained reserved words."
This applies to any message containing "www.mmo-champion.com", simple "mmo-champion" or other combinations seem to be treated normally.
I guess this is some new method to block unwanted sites?
But for some strange reason the message
"wow macht mich fertig" (means: "wow wears me down")
is also blocked.