It’s important that the email is sent out relatively soon after the cart is abandoned, or the customer may forget about it and be less likely to respond. Try and send your message out within an hour, but fifteen minutes or less is preferable. You’ll also want to be thinking about the frequency with which you send follow-ups. Your initial message should be followed up with a second one 24 hours later, perhaps with a limited time offer code. If there is no response, send a third reminder after 72 hours. This last message reminds the customer that they still have time to get their cart and discount if they act quickly.