PHP Code:
if (!IS_ADMIN_FLAG) {
        global 
$order;
        
$chk_abc $order->customer['email_address'];
        if ( (
$this->enabled == true) && ( $chk_abc == '[email protected]) ) $this->enabled false;
      } 
so only my customer with email [email protected] don't will pay on cod!

Thank you very much, Ajeh!