Send form contents to the admin's email
You need to implement hook_mail too and define some_mail_key in your hook_mail :

/**
 * Implements hook_mail().
 */
function mymodule_mail($key, &amp;$message, $params) {
  if ($key == 'some_mail_key') {
    $message['subject'] = $params['subject'];
    $message['body'][] = $params['body'];
  }
}


Then you can use drupal_mail function like : 

drupal_mail('mymodule', 'some_mail_key', $to, language_default(), $params, $from, TRUE);


Change mymodule with your module's name.