foreach ((array)$rcmail->config->get('show_additional_headers', array()) as $header) {
$key = strtolower($header);
if ($value = $p['headers']->others[$key])
foreach ((array)$rcmail->config->get('show_additional_headers', array()) as $header) {
$key = strtolower($header);
if ($value = $p['headers']->others[$key])