Hi Samantha,
Great question, and definitely a great value prop for your customers. This is not something that will be directly supported by Shopify Email and would instead require a third party email notification app.
There are email marketing apps like Seguno: Email Marketing that have a free plan and some automations that might work for you. Definitely worth checking out! You can also review a list of all email marketing apps, free and paid, to see if there is one available that works for you: Shopify App Store - Email Apps.