[Faetyl]

I'd have to take a good look at the "Spam Sentry" to give a 100% sure reply, but to the best of my knowledge it just can't be done.
We as interface author's are very limited as to what we can do with EQ2...

I can say though that I've heard if you just go /anon they can't see you in the channel and therefore can't spam you via the /listchannel command.
I haven't verified it 100% yet, but ever since I went /anon i haven't received any tells or in game mail from spammers...