iptables doubt

hello

i need to block all 205.188.*.* and 64.12.*.* (at least temporaly)

i'm doing:
iptables -I INPUT -s 64.12.0.0/16 -j DROP
iptables -I INPUT -s 205.188.0.0/16 -j DROP

and i keep seeing those IPs RECEIVING packets from my server when I run tcpdump -qn, example:
12:21:26.130030 69.56.xxx.xxx.37070 > 64.12.137.121.smtp: tcp 0 (DF)

they're giving me a good headache with thousands of spam messages for almost 24 hours
i keep banning IPs, but it seens the filter is not taking action (but when I test with my friends IP it worked...)

 

 

 

 

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