How to block Port Frequently Keylogger In Use

Keylogger, so frustrating to be found on the computer you are using, or you manage a computer cafe, several ports that are often used keylogger is the following: 25, 995, 465, 587, 110 or who frequently use email and ftp service.

The ports should be blocked, to minimize fraudulent activity that occurs due to a keylogger. And here's how to block ports used by keyologger:

Open Terminal mikrotik:

ip firewall filter add chain = forward protocol = tcp src-address = 192.168.181.0/24 action = drop port = 21
ip firewall filter add chain = forward protocol = tcp src-address = 192.168.181.0/24 action = drop port = 995
ip firewall filter add chain = forward protocol = tcp src-address = 192.168.181.0/24 action = drop port = 25
ip firewall filter add chain = forward protocol = tcp src-address = 192.168.181.0/24 action = drop port = 465
ip firewall filter add chain = forward protocol = tcp src-address = 192.168.181.0/24 action = drop port = 587
ip firewall filter add chain = forward protocol = tcp src-address = 192.168.181.0/24 action = drop port = 110

And to note, when the agency we used to use a port that port, or SMTP email. It is better to be disabled, or does not have to block ports that called it above, other ports are still a lot that needs to be blocked. Please search for enlightenment more on google.
Source Thank to : routermikrotik.blogspot.com