Drupal 6: Mail Header anpassen (Name und E-Mail)

<?php
/**
* Implements hook_mail().
*/
function custommodule_mail($key, &$message, $params) {
  // Drupal site name und mail as example
  $site_name = variable_get('site_name', '');
  $site_mail = variable_get('site_mail', '');
 
  // Your own values submitted by params from form
  // In hook_form_submit $form_state['values'] is submitted as params in drupal_mail()
  // $name = $params['name'];
  // $email = $params['email'];
 
  if (!empty($site_name) && $site_mail == $message['from']) {
    $message['from'] = '"'. mime_header_encode($site_name) .'" <'. $site_mail .'>';
    $message['headers']['From'] = '"'. mime_header_encode($site_name) .'" <'. $site_mail .'>';
  }
}
?>