We have released a minor update version 2.5.4 for JMailAlerts. In this version we have added Joomla Updates to notify users about new versions and Live Updates support to let site admins receive and install updates right inside Joomla.
Talking more about JMailAlerts, it is one of our most popular free components. It lets you send automated digest emails by picking up data through various plugins e.g. notify users about - New site registrations, News posts, New photos or Videos uploaded in your Jomsocial or CB or Easysocial based community etc.