manage newsletter subscriptions in Magento 2 store will guide you:
Managing Newsletter Subscriptions in Magento 2:
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Manage Newsletter Subscriptions for a customer:
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Cancel a subscription from the Newsletter Subscribers list:
- Navigate to Marketing > Communications > Newsletter Subscribers
- Select the customers with status “Subscribed” for whom the subscription is to be cancelled
- Set the Action control to Unsubscribe
- Click Submit
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Export the list of subscribers:
- In the Newsletter Subscribers grid, use the filter controls to include only records with a Status of
Subscribed
and for the appropriate website, store, or store view - You can export to either CSV or XML
- Save the file