This is also sent whenever a message to listserv is received from which no valid command could be parsed.
HELP groupname lists a brief description of the group requested.
Mail is sent to the address given to confirm the add or delete operation. Mail is sent the address given to confirm the deletions. LIST LIST address lists all mailing lists to which the given address is subscribed. If you omit the 'address' the command will assume the mailbox is in the from line. Faxnumber is the phone number of the desired fax machine, including any necessary dialout prefixes.