To let you work faster when notifying buyers, Shopify now uses a template to prepare the email you send when clicking on “Email Buyer” from an order screen. That means you can set up a form-letter that has the usual stuff and personalize it before it’s sent.
To use the new buyer contact form template, first click on it in your shop Admin section’s Email & Notifications section:
Then edit the template to include the usual text you use in emails to buyers:
Now when you send a buyer an email,
... the templated parts appear already filled in: