You can set up a fully automatic mail reflector, if you're on a Unix system running Sendmail, by using the Sendmail "alias" function (described well in Sendmail, the O'Reilly & Associates "bat book"). If your system administrator is willing to set up a special alias for your list, you can maintain the list simply by editing the file to which the alias points, and people sending mail to the alias will have their mail bounced out to the whole list. (Some systems include specific support for lists, i.e. DG/UX's use of a "lists" directory for aliases as noted by windigo@thepoint.com.) Be warned, though, that this approach has a lot of problems--mailing loops are a distinct possibility, and there's absolutely no control over who can post to the list, or what they can post. If you must have automatic distribution of messages, you should look into using an MLM.