How to create a Rule to email referenced authors after saving new content? I am trying to create a review platform. I have multiple content types, and I have created review content types which are referenced to these content types.  

I want to create an action (tell me if you think there is a better way) which would send an email to the original content author to notify them that a review has been published about their content.

Any ideas how to do this or if it's possible?
Actually it's a LOT easier than I thought. I found that the following worked for me so far:

node:referenced-field:0:author:mail


I hope that this helps someone.