Okay, I guess this is the fabled feature of WP that has been lacking. What I dont understand though is why it has to be so complicated or difficult to do it.
For instance facebook make it seem really complicated, by having unique email boxes setup, and that isn’t practical for everyone, I am thinking off the top of my head here, but why not have a single pop box for the server to pull the replies from, and a code in the subject will dictate who its from or going to on the system.