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Cisco ios firewall question

I read the cisco documentation about the secuirty using the cisco ios firewall. I found out in the IDS command ip audit smtp spam. Is this single command enough to contain the number of receipents that can be send from external network ar should i specify any interface for the above command. I have cisco 3640 with 12.2 ios. Is there any way i could configure it to act as application firewall. I saw in cbac command about some ip inspect command. But those commands are general and not specific to any particular ip like the ip tcp intercept command. Is there any good links with configuration example about CBAC and Cisco IDS.

Thanks in Advance

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