Everything is working fine but too much spam is going out from my network to unknow domains but i can see the ip adress of those domain which are like 168.95.5.x
i tried to block that ip adress in the linux box both inward and outward as below
iptables -I INPUT -s 184.108.40.206/24 -j DROP
iptables -I INPUT -d 220.127.116.11/24 -j DROP
But it is not working i can still see the spam going out from my network to the above ips as well as incoming also. Can you please suggest the best way to get rid of this problem.