System.err.println ("IncomingEmailLinkProtocol: unregisterClient"); e.printStackTrace();
log.error (stackTraceToString (e));
  public final void unregisterClient (MessageTransportClient client)   {     if (myMailData == null) return;  // no data to unregister    try     {      MessageAddress clientAddress = client.getMessageAddress();      getNameSupport().unregisterAgentInNameServer (myMailData, clientAddress, PROTOCOL_TYPE);    }     catch (Exception e)     {      System.err.println ("IncomingEmailLinkProtocol: unregisterClient");      e.printStackTrace();    }  }