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At magento 2 back end, we created many available events such as Abandoned Cart, Customer Birthday, Customer Registration, Order Is Placed, Order obtained status pending payment , ... and more in Ultimate Follow Up Email extension. You only choose events that they want create and set them by entering some fields such as the content email, the content SMS, time to send emails/SMS and so on. Then, they will automatically send to customers. This is really useful and convenient for the business because the owner store can easily control contents sent and choose the best time to send your email marketing campaigns.
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