You need to do this with firewall, not QoS.
That is, if the firewall settings are capable of doing it on this router. I actually don't think you can achieve this with your router.
Log into your router, go the firewall settings page:
- Click on Manual Setup button
- Click on Advanced (on the top)
- Click on firewall and DMZ button (on the left)
Create a block/deny rule for everything, from IP 126.96.36.199 to 254.254.254.254, you may need to put in ports, 0-65000. (you will need to lookup the actual high end port number, but that should cover you to start with).
Then create allow rules for the same IP range 188.8.131.52 to 254.254.254.254 for each of the service port destinations that you want to enable, port 25 to smtp, port 80 for https, port 443 for https, etc.
If this does not work, then you can not achieve what you want to do with with your router.
You could achieve what you want to do with an old computer repurposed as a Firewall/Router. IPCop, SmoothWall, M0n0wall, and pfSense all come to mind immediately. Or you could buy a Cisco or Juniper device.
QoS is for
Quality of Service which has to do with traffic prioritisation.
ref: dlink 605L emulator http://support.dlink.com/Emulators/dir605L/111/index.html