I'm very new to Zimbra and I'm experiencing some kwnoledge about administering a mail server. I'm setting up a server for a customer who needs to forward 10.000/15.000 mail per day, about. I'm in trouble because I'd like to choose the best solution to manage this important task but I'm confuse. It's better to use ZCS (I think) or a mailing list software like Majordomo or Courier???