Some discussion groups have membership criteria, and this can be handled by returning the list's rules upon the request to subscribe. The potential subscriber would then email the moderator with their qualifications. Sophisticated email readers like the option to receive their discussion groups messages in a digest format. This digest is simply an accumulation of all the individual messages, typically for an entire day. The digest is available in either standard or multi-part format.
Most discussion groups function just fine by themselves.
If a particular subscriber gets out of hand, you can easily delete their address from the list, thus stopping future postings. And since you are approving each new subscriber, you have control over who gets on the list. To start your own discussion group mailing list, please answer these questions, and our mailing list specialists will start setting up your list right away.