Ok, so most people have never heard of Klaviyo, we get that. The thing is, it's one of the very best autoresponders for eCommerce stores! It has a deep integration with Shopify (and Shopify Plus!), Magento, BigCommerce, and WooCommerce. They help you track sales through your emails, and have a full suite of reporting tools. They even help you create automated Facebook Custom Audiences based on the interactions of your customers!