if (myMailData == null) return;
  public final void registerMTS (MessageAddress addr)  {    if (myMailData == null) return;  // no data to register    try     {      getNameSupport().registerAgentInNameServer (myMailData, addr, PROTOCOL_TYPE);    }     catch (Exception e)     {      System.err.println ("IncomingEmailLinkProtocol: registerMTS");      e.printStackTrace();    }  }