/**
* Inherited phpMailer function adding a header to email message.
* We override it to skip X-Mailer header.
*
* @param string $sName header name
* @param string $sValue header value
*
* @return null
*/
public function headerLine($sName, $sValue)
{
if (stripos($sName, 'X-') !== false) {
return;
}
return parent::headerLine($sName, $sValue);
}