zend framework zend_mail function error included code

Question

I get the following error when I use zend_mail() function the following code :

Error on Page :

An error occurred

Application error

My code for sending mail using Zend_Mail() which I included in indexcontroller.php:

public function passchangeAction()
{
    $mail = new Zend_Mail();

    $mail->addTo('maymail@gmail.com', 'my name')
         ->setFrom('mymail@gmail.com', 'my name')
         ->setSubject('My Subject')
         ->setBodyText('Email Body')
         ->send();
}

There is no code present in passchange.phtml