That's a good question, but some systems do seem to find away around the mute facility.
What I was hoping, was to find a way to block it completely. But damn if I'm going to get myself "pregnant" just to find out how it works!! lol
Ceera's suggestion would be ideal, but haven't seen anything which spoofs the system as a way of blocking it. I have found it spams on chat channel 2, so maybe I'll script something to log it's messages and see if I can't work something out myself.
In the mean time, I'll just carry a large pair of scissors with me. That and the promise that if someone does get me pregnant, I will be the last girl they ever do!!