IPs blocked still able to connect

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Hello

I blocked a subnet by using the following command:
iptables -A INPUT -s 222.0.0.0/8 -j DROP
I then saved it to file
iptables-save > /etc/sysconfig/iptables
and did an iptables -L INPUT to verify that it is in
DROP       all  --  222.0.0.0/8          anywhere

However, i am still receiving SPAM from IPs within that subnet (and others)
long after I thought I completely blocked them from connecting to my server.

I am using RedHat 9 with sendmail, no outgoing SMTP allowed. 

Does anyone have any feedback on this?
Thank you




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