The basic principle of an e-mail discussion group is that a host
computer (server) maintains a list of subscribers to a discussion.
Every time a subscriber sends an e-mail message to the list, that
message is automatically sent back out to all the other
subscribers. You use regular e-mail both to send commands to the server, and to post messages to the list's subscribers.
Slide show generated from lists.html by Weasel 2007 Mar 7