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Hi,
Thank you for reaching out to us.
Please add the shortcode {{ignore_9mail}}
to the email content of 9Mail plugin, and check again.
Our can see this part of our docs.
Best regards.
Thanks, problem solved.
Of course, I will correct your writing that {{ignore_9mail}} should be placed inside the content of WooCommerce Email Template Customizer plugin emails.
In general, we should put the {{ignore_9mail}} shortcode inside the email content of third-party plugins whose emails we want not to use the 9mail plugin email template.