I even included a link directly to the product to review in the email. How could I have done this better?
Here's a real example. I blanked out personally identifiable information.
Once again thank you for your XXXXX order and I hope that your XXXX enjoy it as a much as you do!
We've recently added a reviews section to our site that will help people make decisions on which XXXXX would best suit their needs. After all, there's no better advice than advice from an actual user! Hearing from our valued customers will also help us improve our products and customer service.
If you could kindly take a couple of minutes of your day and write a quick review, we would greatly appreciate it.
To write a review, go to the product page for the product(s) that you ordered and click on the "Reviews" tab. Then click the link that says "Write a review."
In exchange for your time, here's a $10 coupon that you can use for your next order (its good until February 28, 2017). Enter it in while checking out.
Thank you so much and have a wonderful evening. Please let us know if there's anything else that we can do for you.