As noted before, flaming, rudeness and commercial advertisements will not be tolerated. If you are unable to follow these rules, you will be removed from the list. If you're going to post an email to the list, the title of your message should be clear enough to convey the purpose of that message. Don't post huge messages. You should always say what you want to say, but don't post messages that drag on for pages unless you've got a really good reason for it.
Long messages are slower to process and can cause bottlenecks in the listserver.
So if you want to announce that you've got a call for registration for a conference, post a summary and let us know how to get a copy of it, instead of posting the entire conference program. Ideally, when a person posts a message to the list, we all like to see responses posted as well, assuming the original poster hasn't requested that the responses be private. And whenever possible, trim the size of the original message - there's no reason to repost the entire original, since we've all seen it before. Instead, include the highlights and key points to which you're responding. Be sure to say exactly where you are - for example, if I signed my messages Andy Carvin, Cook Middle School, no one will be able to tell if I'm in Arkansas, Australia or anywhere else.