Mailing lists are electronic discussions that are held via e-mail.
Instead of sending an e-mail message to just one person, you send it the mailing list. The message is then distributed to everyone subscribed to the mailing list. Advantages Membership can be open or closed. An open list allows anyone to subscribe themself to the list, whereas with a closed list, the list owner must approve the subscription request. Only those who subscribe to a mailing list can read and participate in the discussions.