Code Snippet is disabeling template for all mails instead of defined “subject”

Hallo Hannes @huet

So I’m using your snippet to disable the template for specific words in the subject string:

/* disable email template for multiple subjects */
add_filter( 'haet_mail_use_template', 'customize_template_usage', 10, 2 );
function customize_template_usage( $use_template, $mail ){
  if( strpos( $mail['subject'], 'order' ) !== false
      || strpos( $mail['subject'], 'Bestellung' ) !== false 
      || strpos( $mail['subject'], 'Password' ) !== false 
      || strpos( $mail['subject'], 'Passwort' ) !== false 
      || strpos( $mail['subject'], 'created' ) !== false 
      || strpos( $mail['subject'], 'erstellt' ) !== false
      || strpos( $mail['subject'], 'Dank' ) !== false¨
      || strpos( $mail['subject'], 'Thank' ) !== false )
    return false;
  return $use_template;
}

But: with this code in my child themes function.php it disables the template for all mails, even the Test-Email send from your plugin.

How come? Did I miss something?

It would be really kind if you could help me out.

Thank you!
Elìa

The page I need help with: [log in to see the link]