Why doesn't my code send emails?

I am using the following code to send emails, but it doesn't work. What is wrong with it?

function yukerja_view_contact_import_form_submit($form, &$form_state){
  global $user;
  $c_user = user_load_by_name($user->name);
  $uid = $c_user->uid;
  $profile = profile2_load_by_user($uid, 'recruiter');
  $field = $profile->field_recruiter_company;
  $tid = $field['und'][0]['tid'];
  $term = taxonomy_term_load($tid);
  $company = $term->name;
  $query = db_select('import_contact');
  $query->fields('import_contact', array('name', 'email', 'company', 'operator_insert', 'status', 'matches'))
    ->condition('company', $company,'=')
    ->orderBy('name', 'ASC');
  $table = $query->execute();
  $a;
  $b;
  $email_user = array();
  foreach ($table as $key => $values) {
    $email_user[$key + 1] = array( 
      'name' => $values->name,
      'email' => $values->email,
      'company' => $values->company,
      'operator_insert' => $values->operator_insert,
      'matches' => $values->matches,
    );
  }

  $params = array();
  foreach ($form_state['values']['table_user'] as $key => $value) {
    if(!$value == 0) {
      $email = $email_user[$key]['email'];
      $params = array(
        'name'            => $email_user[$key]['name'],
        'email'           => $email,
        'company'         => $email_user[$key]['company'],
        'operator_insert' => $email_user[$key]['operator_insert'],
        'matches'         => $email_user[$key]['matches'],
        'link_jobklik'    => 'http://dev.yukerja.gotpantheon.com',
        'subject'         => 'Invitation',
        'body'            => 'body tes',
        'from'            => 'as'
      );

      $module = 'yukerja_view_contact';
      $key = 'key';
      $language = language_default();
      $from = $params['operator_insert'] . "@jobklik.com";
      $send = FALSE;
      $message = drupal_mail($module, $key, $email, $language, $params, $from, $send);

      $message['subject'] = $params['subject'];
      $message['body'] = array();
      $message['body'][] = "Invitation";
      $message['body'][] = $params['link_jobklik'];

      // Retrieve the responsible implementation for this message.
      $system = drupal_mail_system($module, $key);

      // Format the message body.
      $message = $system->format($message);

      // Send e-mail.
      $message['result'] = $system->mail($message);
      // drupal_mail('yukerja_view_contact', 'invitation', $email, language_default(), $params, $params['from'], TRUE);

    }   
  }
}