Announcement Lists are ‘one-way’ where the list organizers send information to subscribers. Only the list organizers initiate an e-mail to the subscribers.
Discussion Lists are ‘two-way’ where the recipient typically replies to the entire list for discussion. Any list member can initiate an e-mail to the subscribers.
Group Managers: A help page for discussion list managers is provided. (You must be logged in with your group manager account.) Click here.