As a default, all of your customers receive loyalty emails.
How to only send loyalty emails to customers who accept marketing in Shopify
1. In your Marsello app admin, go to Settings
2. Under Email Notifications, go to Only Email Customers Who Accept Marketing in Shopify and turn it ON
3. Click Save
Now your loyalty program emails will only send to customers who accept marketing in Shopify.
💡Quick Tip: In your Shopify settings, we suggest defaulting the option to accept marketing to ON, so customers must opt-out if they don't want to receive your emails. You can check this under Settings > Checkout > Order processing