Note that the digest groups are purposefully closed to mailings. You may subscribe to them, but you may not send mail to them. 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 delete operation. A command must be the first word on each line in the message. Lines which do not start with a command word are ignored. If no commands were found in the entire message, this help file will be returned to the user. Please note that is IS possible to delete someone else's subscription to a mailing list.