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. Each discussion group, or list, is identified by a list name and by the address of the computer which hosts it.
All interactions are via e-mail.
The e-mail message consists of standard commands , one command per line. For some groups your subscription request will be handled automatically, for others the list owner may screen it. Once you have subscribed to a group, you can actually send a message to all the subscribers by sending e-mail to the name of the group. You will automatically receive messages from other subscribers via e-mail. It doesn't matter what you specify for the subject line.