Mailing lists are handled through ezmlm. They are a bit of a mess. Reading this will hopefully allow you to not add to this mess.
Lists
announceSYY: Each activities fair we make an announcement list with this format. We send it a few messages over the course of the following few weeks. After that it should be abandoned, with a final message telling people to subscribe to members, event-announce, and downtime-announce. It may also be wise to automatically subscribe people to downtime-announce.
members: For informal discussion between members. People should be told to subscribe to this if they are interested in joining the club. People should probably also be subscribed when they are given a club account.
downtime-announce: What the name suggests. Try to avoid creating a situation where members has more people on it than this list, meaning that notifications need to be sent to both.
event-announce: For major event announcements. Again, subscribers to this list should more or less be a superset of members.
operations: This list is private. For discussions of organizational details and machine room operations.
officers: What it sounds like. Only with far more people on it…
Administration
ezmlm is a pain. Basically you just need to get afs admin and then use the ezmlm-FOO utilities to do stuff. A few common operations:
Subscribing someone to a list
ezmlm-sub /afs/club.cc.cmu.edu/usr/ezmlm/LISTNAME EMAIL