As per the requirements listed in the introductory part, we need to create a back-end where we will store the subscribers’ contacts and information. Since everything in SharePoint is stored in lists or in libraries, we will use a Contacts List to hold our users’ information. We need anonymous users to be able to contribute to this list by adding their contacts without giving them any sort of access to the list views. In addition, we need to set in motion the content approval feature provided by SharePoint to stop subscribers from receiving e-mails unless they are permitted.