code: public boolean verifySender(InetAddress remoteAddr) {
          boolean returnValue = true;
  
          if (alists != null) {
              returnValue = !alists.accessDenied(remoteAddr);
          }
          return returnValue;
      }
docs: Verify whether the remote address is allowed to communicated with the
  channel.
  
  @param remoteAddr
  @return boolean - false means it is denied