well, it isn't possible with the MSgPlus.net API
i tried it before too: crYpt
i'm now jsut waiting for the new msgplus & msgplus Plugin pack to come out, and see how to be able to do it.
bu i don't believe Patchou is going to allow us (plug=in writers) to change text send by some1 else
./..........................and yes, i would like to be able to do that