Email Spammer protection from Mikrotik

#Email#Spamming#SMTP#Protection#From#Mikrotik

/ip firewall filter
add action=drop chain=forward comment=”BLOCK SPAMMERS OR INFECTED USERS” dst-port=25,26,465,587 protocol=tcp src-address-list=spammer
add action=add-src-to-address-list address-list=spammer address-list-timeout=1d chain=forward comment=”Detect and add-list SMTP virus or spammers” connection-limit=30,32 dst-port=25,26,465,587 limit=2,1:packet protocol=tcp

connection-limit=30,32 [30 connection and 32 subnet(single user)]
limit=2,1 [per second 2 mail and 1 buffer]