With this filter, the headers of the feedback emails can be manipulated, or extended. By default Helpful enables UTF-8 encoding and allows HTML. In our example we add another email in CC.

 * Replace the email headers of feedback emails.
 * @link
 * @param array $headers
 * @return string
add_filter('helpful_feedback_email_headers', function (array $headers) {
    $headers[] = 'Cc: John Doe <>';
    return $headers;
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