Acknowledge HTML email CFDB

Many form plugins that CFDB integrates with (like Contact Form 7) do this already.

To make your own, you would need to write some PHP. You would add a filter function on a CFDB hook that gets triggered when a submission happens. Then you would call wp_mail().

See: https://cfdbplugin.com/?page_id=747

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If CFDB can capture the form submissions then you can add this hook. It can capture hard-coded html forms by placing [cfdb-save-form-post] on the page the form submits to.