Knowledgebase
Mailman (open source)
Mailman is a mailing list management program that is freely available with all FastQ hosting packages.
This application can be setup by clicking on Mail > Mailing Lists in your Plesk control panel.
Basic setup of this program will allow for normal mailing list operations, where all members of the list can converse with each other.
Advanced setup is required in order to use it as a one-way information tool, where only administrators or moderators can post messages to the list.