Use YayMail to customize the email templates sent by Back In Stock Notifications (by WooCommerce).
Email Customizer for Back In Stock Notifications
Back In Stock Notifications helps you notify customers when your products are restocked.
It sends these back-in-stock alerts via email opt-in:
Back in stock notification
Back in stock sign-up confirmation
Back in stock sign-up verification
Want to customize those email templates? You’ve come to the right place! This YayMail Addon for Back In Stock Notifications is here to help!
This extension allows you to build the back-in-stock email templates in an exclusive email customizer that you can find nowhere else! Take a look at its available license and choose one!