private static String[] extractEmails(MailMessage message, String headerField) {
   String[] adresses = StringHelper.split(message.getFirstHeaderValue(headerField), ",");
   if (adresses != null) {
     for (int i = 0; i < adresses.length; i++) {
       adresses[i] = adresses[i].trim();
     }
   }
   return adresses;
 }