The host computer uses mailserver software to distribute messages. It also maintains a list of subscribers and may store archived messages and other files. Although all of these programs offer similar functions, they often use different commands, and some programs offer more features than others. There are lists of essential commands for various systems in the Mail Server Commands page of this online handout. You may also download guides to essential commands through your e-mail account.
Most discussion groups have a human administrator, or list owner .
List owners troubleshoot problems with subscriptions and e-mail addresses. More on this as we continue. All commands are sent to the administrative address. If you have a signature file, it is a good idea to turn it off or delete it from the message, before sending a mail server command. Commands are almost always written in the body or text of an e-mail message.