Block an IP if there is number of connection within a time limit ??

[Ditro - BipinDas <bipindas.k@xxxxxxxxx>]

Dear List,

I do have a Exim mail server with IPTABLES and TCP WRAPPER as firewall. 
Yesterday I had noticed that,there is continuous smpt connection from an 
IP. I would like to block these IP,if there is more than 10 connection 
in 30 second. Is this possible using IPTABLES command. If yes,Please 
guide me.

Thanks in Advance
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