Act as a Server

Alright, I'm just looking for two answers: If it can be done and how? I don't want code though, that's up to me to figure out. I'm about make a script, somewhat like a mailing list, where users can contact each other through a web based system or by email. My question is, can I get PHP to somehow act as the server where all the emails come in? What I means is like if I were to send an email to list@php.net, how could I get PHP to pick the email up and distribute it out like a mailing list? Would this require the configuration file to be changed or what? Any help here would be appreciated. I don't think this has been done before, or else I would have read their code and seen how they did it. Thanks, Stephen Craton http://www.melchior.us