An email is returned listing all the available mailing lists. A mailing list is available if it is a distribution group inside the Active Subscriber 2017 container. If a prefix is specified, then the list is filtered to include only mailing lists whose name starts with the prefix.
Use the lists command to find out what mailing lists are available to join.
prefix, which may be quoted, is used to filter the mailing list. If the
prefix is specified then only mailing lists whose names start with the
prefix will be returned.