In this tutorial we will show you how you can send email campaigns using the default mail feature in OpenCart 3.x. How you can send to all clients or some clients, all newsletter subscribers or a certain customer group.

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Source - opencart blog

https://www.opencart.com/blog

https://www.opencart.com/blog/how-to-send-emails-using-the-mail-feature-in-opencart-3-x