David Powers Lesson08 forgotten.php problem

Question

I have a strange problem when running forgotten.php. The program works alright initially with the setting of mail_connector.php as below. I managed to send and received email. Everything works fine intially. After sometime, I found problem running the same program again. This time it generates error message of 'Notice: Underfined index: [email protected] in c:\vhosts\phpcs5\lesson8\scripts\request_reset.php on line 25' and also message 'No connection could be made because the target machine actively refused it.'
Any idea why ?
Mail_Connector.php
<?php
$mailhost = 'mail.agri-organica.com';
$mailconfig = array('auth'     => 'login',
                    'username' => '[email protected]',
                                                  'password' => 'password');
$transport = new Zend_Mail_Transport_Smtp($mailhost, $mailconfig);
Zend_Mail::setDefaultTransport($transport);

Answer 1

I changed the From header using agri-organica.com address and send to yahoo address. This time it shows:
'No connection could be made because the target machine actively refused it.'
Request Received
An email has been sent to your registered address with instructions for resetting your password.
Request_reset.php
<?php
$errors = FALSE;
$result = FALSE;
if ($_POST) {
  require_once('library.php');
  require_once('mail_connector.php');
  try {
          $val = new Zend_Validate_EmailAddress();
          if (!$val->isValid($_POST['email'])) {
            $errors = TRUE;
          if (!$errors) {
            $sql = $dbRead->quoteInto('SELECT user_id, first_name, family_name, email FROM users WHERE email = ?', $_POST['email']);
            $result = $dbRead->fetchRow($sql);
            if (!$result) {
                    $errors = TRUE;
            } else {
        // update database and send mail
                    $token = md5(uniqid(mt_rand(), TRUE));
                    $data = array('token' => $token);
                    $where = $dbWrite->quoteInto('email = ?', $_POST['email']);
                    $dbWrite->update('users', $data, "user_id = {$result['user_id']}");
            $mail = new Zend_Mail('UTF-8');
            $mail->addTo($result['email'], "{$result['first_name']} {$result['family_name']}");
            $mail->setSubject('Instructions for resetting your password');
            $mail->setFrom('[email protected]', 'Calvin');
            $link = "http://phpcs5/lesson8/reset.php?id={$result['user_id']}&token=$token";
            $message = "Use the following link to reset your password. This link can be used once only. $link";
            $mail->setBodyText($message, 'UTF-8');
            $mail->send();
  } catch (Exception $e) {
          echo $e->getMessage();