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public function test() {
      $controllerAction = $observer->getEvent()->getControllerAction();
      Mage::log("TEST success", null, "dev.log"); // for your logs
      Mage::getSingleton('adminhtml/session')->addError(Mage::helper('MI_ProductAutoSynchronization')->__('Error sending Email'));
      Mage::app()->getResponse()->setRedirect($controllerAction->getUrl('*/sales_order/')); //the controller where you want to redirect
      Mage::app()->getResponse()->sendResponse();
      exit ;
}