Plugin Question

Hi I have just been checking out your easy review reminder plugin for use on a clients woocommerce store and I just need to ask a question about the way the plugin works.
What I would like to know is does the plugins logic check if the customer has previously reviewed the product they have just purchased or does it just blindly send out these emails each time a customer makes a purchase?
What I do not want to do is bug the shit out of customers asking them to keep reviewing the same product every time they make a new purchase.
I will look forwards to your reply.
Pete
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