I am trying to use zend mail to send an e-mail. This is the code that I am using: private function _sendEmail($receiver, $email, $subject, $from = '') { $mail = new Zend_Mail('utf-8'); if ($from == ''){ $from = _text('fromAFriend'); } $mail->setFrom($email, $from); $mail->addTo($email); $mail->setSubject($subject); $url = $this->_getSiteUrl(); $mail->setBodyText("_text('youHaveBeenTipped')". $url . $email); try { $mail->send(); } catch (Zend_Mail_Exception $e) { echo $e; } } The error I get is: Zend_Mail_Transport_Exception: unable to send mail. Any ideas?