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How to block the SMTP port 25 on Cisco router

Hello All,

                We are running ISP and now a days we have many spam in our network, we want block the SMTP port 25 block on Cisco router 7200. We have not any smtp server. we want block the port 25 at our core router. So we can block the spam in our network .Please advise me for this its urjent issue.

Thanks

Mukesh

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