Subscribers are welcome to share announcements about upcoming performances and conferences, newly published bibliographic sources or course materials, and newly opened internet resources relevant to this list. If it's relevant to the list, I'll be happy to do so. There are, however, two No-No's.
Friendly disagreement is fine, but flame wars are verboten.
I will not hesitate to do whatever necessary to quash them, up to removing the participants from the list. The second thing is the posting of commercial advertising on unrelated topics on the list. Again, the listowner will take any steps necessary to discourage the sender, including submitting a complaint to the spammer's account administrator.