Client changing the order after placement

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Hey, guys! I'm currently looking for a solution that I don't even know if it exists. My shop has free shipping on orders above $40. Is it possible to send an automated e-mail to every customer who places an order and tell them something like " hey you get free shipping if your order exceeds $40, you can change your order here {{link}}" or there's no way for the client to change the order once it's placed? Thank you so much in advance.