public function run()
 {
     if (!$this->getForm()->validate()) {
         echo $this->renderConfirmationForm();
     } else {
         $prefix = $this->grid->getId() . '_';
         foreach ($this->getForm()->getValue() as $k => $v) {
             if (strpos($k, $prefix) === 0) {
                 $this->_vars[substr($k, strlen($prefix))] = $v;
             }
         }
         // disable emailing
         Am_Mail::setDefaultTransport(new Am_Mail_Transport_Null());
         return parent::run();
     }
 }