This free service is supported by advertising. Many people on the internet use a listserv to communicate to large groups. A listserv is a kind of group mailing list. A member of a listserv sends an email message to the listserv and the listserv then sends the message to everyone on the list. Schools may consider setting up a listerv for their teachers, parents or students in a specific grade, activity or club.
Some teachers use a listserv to communicate with the students in their class.
Individuals can set a free eGroup list that others may join. Email sent to the list is automatically sent to everyone on the list, just like a listserv. This free service is supported by advertising. School groups may use calendars posted on the internet to share schedules with others. Calendar lets you set up a free individual or group calendar that may be public or private.