Plex is great, but as Joaqium wrote we are all too busy. As for the spam, I suggest plugging in DCC, (search freshmeat.net) the Distributed Checksum Clearing house, since I turned it on I haven't had one clear spam that wasn't detected as such.
You can run it via procmailrc, or any kind of filter on before the message gets mailed back out. I can set this up if I can have shell on the box that manages the mailing list. Sam