Reminder module recommendation
Checkout this module Subscriptions


  This module enables users to subscribe to be notified of changes to
  nodes or taxonomies, such as new comments in specific forums, or
  additions to some category of blog. Once enabled, all nodes will have
  an additional link that allows the user to change their subscriptions.
  Users have tab on their user screen to manage their own subscriptions.
  Users can also set an auto-subscribe function which notifies the user
  if anyone comments on posts they have made. Admins can turn this on by
  default.