code: public void send(Message message)
    {
      Transport smtp = null;
  
      try {
        smtp = _session.getTransport("smtp");
  
        smtp.connect();
  
        smtp.send(message, _to);
  
        log.fine(this + " sent mail to " + _to[0]);
      } catch (RuntimeException e) {
        throw e;
      } catch (Exception e) {
        throw new RuntimeException(e);
      } finally {
        try {
          if (smtp != null)
            smtp.close();
        } catch (Exception e) {
          log.log(Level.FINER, e.toString(), e);
        }
      }
    }
docs: Sends to a mailbox