An email service in which individual members post messages for all group members to read (“many to many.”) In contrast, a newsletter is a “one to many” broadcast, where comments by members or subscribers go only to the message sender. Aka by the trademarked name Listserv.

Building and managing an opt in list for a website
Building and managing an opt in list for a website provides a seller direct access to a wide number of potential customers. Building and managing