There is an Abandoned Cart feature - https://www.ecommercetemplates.com/help/taking_orders.asp#orders7. You need v.6.7 or higher. And here is how you edit them - https://www.ecommercetemplates.com/help/email-messages.asp#abandoned
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I know there is an Abandoned cart feature however it would be much more useful to have an Abandoned cart send button on the order detail page since you always have to check the details before sending and the current way to send an Abandoned cart email is very cumbersome and inefficient.