Trigger.module

Many blogging tools and CMSes can automatically send out a notification message when new comments are added to a post. Drupal does not have a setting or checkbox to do this automatically. Instead, in typical Drupal fashion, it gives us the tools to set it up ourselves and customize it as desired using "actions" and "triggers".

For this recipe, we will be using the trigger module (core), as well as the token module (contrib). Token module is not strictly required for this task, but it makes it possible to send a much more informative notification.