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public function test() {
      Mage::log("TEST success", null, "dev.log"); // for your logs
      Mage::getSingleton('core/session')->addError('Error sending mail'); //error message
      /*Mage::getSingleton(‘core/session’)->addSuccess(‘Success message’); succes message*/ 
      $url = Mage::helper('core/http')->getHttpReferer() ?Mage::helper('core/http')->getHttpReferer()  : Mage::getUrl();
      Mage::app()->getFrontController()->getResponse()->setRedirect($url);
      Mage::app()->getResponse()->sendResponse();
      exit ;
}