If you are running a site where multiple authors are working on content submission on your blog then you are going to live this simple plugin Pending Submission Notifications. It is a very simple plugin that will send out an email when a new article has been submitted by any contributor for review to admin. The contributor will also receive an email as well when the content is published or approved by admin.
First of all get the plugin from above link and install it. Upon installation you will see the settings page in Settings>Pending Submission Notifications:
When submitted content is approved by admin then an email notification will be sent out to the above email address.
If you face any difficulty installing or activating the plugin then just leave a comment below. For learning about more useful free plugin check inWordPress Plugin category.