Hey there, @KatyLee
Bo here from Shopify Support!
That is a great question. In order to do this, you will need to set up with a third-party email host such as GSuite or Zoho as Shopify does not provide email hosting. You can read up on setting up your email with Shopify in this guide.
Let me know how this goes and if there is anything else I can assist you with, I'm happy to help!
All the Best,