Right, we'll be going round in circles here.
Is nitwzim.no-ip.info the domain name that points to your server? If not what is the domain name and do your public DNS records point to it? You can check that
here The IP address 203.193.129.103 does respond to a ping but that doesn't mean anything, it wont allow a telnet to port 25 at that address. Why are you mentioning two IP addresses?