How can I send an email to site admin and vice-versa when user returns a product using commerce_rma? I am using the Commerce Return Merchandise Authorization module for handling returns. It is working fine .

But one thing I want that when a user returns an order using commerce_rma then a notification mail should be triggered to the site admin, and also when the admin accepts user request or declines user request a notification mail should go to the user.

How can I do this ?
You could use Rules Module


  The Rules module allows site administrators to define conditionally
  executed actions based on occurring events



There are events created in rules when Commerce RMA is installed such as After creating a new return