If you have a Feefo account, then you can integrate with it via the Magento connector to make use of its trusted ratings, reviews and feedback on your products.
Access Feefo settings by going to System > Configuration > DOTMAILER > Automation > Feefo.
How to set Feefo integration up
To do this, provide your Feefo login, set the amount of reviews per product, enter the name of your logo template (optional) and make use of the service score and product reviews URL provided. The service score URL will create an external dynamic content block providing your current Feefo score (this continually updates itself), whilst the product reviews URL will get reviews for abandoned baskets/carts, based upon the reviews per product you've set.
The above also applies for Magento 2.0, with the only difference being that the 'Feefo Feedback Engine' section is found by going to Stores > Configuration > DOTMAILER > Automation.