Multiple commands can be included in a single email. Typical information would include the purpose of the list and any guidelines for posting. Unsubscribes an email other than that from which the message is sent.
Many additional commands require a password included in the body of the email in a specific manner.
The slc account is the list owner for both lists. This account will receive messages noting any errors that occur, attempts by someone not on the list to post a message, etc. You can also use this account to manage the list configurations and add and delete subscribers. For additional information, please see a server administrator.