Well I kinka like not having a lot of addresses on the "To" line. It makes the mail look better. Since we are a backbone site having stuff sent via DIST2 is a lot better in terms of over all network load. The fact that there are a varity of mailers on the network can make any attempt to send single files based on what mailer is in use a very hard job. TCP/IP with SMTP adds more to the problem. In our area there are several backbone servers which means that the number of messages distributed individually to other sites is reduced. Any site which has a large volume of list mail may wish to consider installing a backbone server or have a near by node become a backbone server. It really doesn't take that much effort or disk space and would again cut down on network traffic.