A freind of mine recently asked me about email lists.  The great thing about social networking is that I didn't know how to do it, but a Friend of mine did and another friend told me that friend knew and even wrote a pdf on the subject. 

http://www.combined-knowledge.com/Downloads/How%20to%20configure%20Email%20Enabled%20Lists%20in%20Moss2007%20RTM%20using%20Exchange%202003.pdf This is an extreamly detailed 14 page article oh now to set up a librariy "to recieve incoming e-mail using standard e-mail address that can be used both internall and externally" quote from document.

I met Steve Smith in Berlin (did I mention what an awesome conference that was) he's part owner of Combined-Knowledge, really a great guy and I can certainly understand how he's become so successful.  If you ever get a chance to see any of his presentations I would strongly recommend it.