For most eCommerce businesses, one of the biggest leaks in their sales and marketing funnel is shoppers who add products to their cart, but then abandon them at checkout.

For abandoned email, I use https://designmodo.com/postcards/ , just because they are very good designed and coded.

For example, I recover ±2500$ every week with abandoned emails. Some reports suggest that most eCommerce sites have an abandoned cart rate of 15%, in my case is 25%.