Export newsletter subscribers email CSV from the module
Import to Klaviyo as mentioned in this Article: https://help.klaviyo.com/hc/en-us/articles/115005078487-How-to-migrate-existing-email-subscribers-and-unsubscribes-into-Klaviyo
Export newsletter subscribers email CSV from the module
Import to Klaviyo as mentioned in this Article: https://help.klaviyo.com/hc/en-us/articles/115005078487-How-to-migrate-existing-email-subscribers-and-unsubscribes-into-Klaviyo