Blocking IP

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Dear all,

My mail server received so many virus mails from ip 202.145.10.147 and after
i look at gateway (linux) and i using iptraf i see so many traffic from
202.145.10.147.
After that i try to block all traffic from 202.145.10.147 with command :
#iptables -A INPUT -s 202.145.10.146 -j DROP

but i still receiveall traffic from 202.145.10.146......
Can anybody help me ........... that ip send virus in to mail server more
then 20 mails per minute.......


Regards,
David Kandou

Help me ... iam so confused

FYI :
Iam using RedHat 9
eth0 --> ippublic
eth1 --> local ip
mail server --> local ip



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