When customers choose to opt-out of receiving email communications from you, they won't receive campaign emails about your referral program.
You can override your customers' marketing email preferences if they are unsubscribed from receiving referral campaign emails from your store.
Overriding email preferences
To ignore marketing email preferences:
On the dashboard, click Campaigns > Settings.
Scroll down to find the Marketing Emails section. Click to expand.
Check Send emails even if customers do not opt-in at checkout.
Click Save changes.
If checked, you can send referral emails to customers even if customers do not opt-in at checkout.
Shopify: Overriding email preferences applies only to the customer's first purchase. If the customer is unsubscribed, they stop receiving referral emails for their second and future purchases, even if the option is checked.
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