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Community Member

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.

             So we can block the spam in our network .Please advise me for this its urjent issue.

Thanks

Mukesh

3 REPLIES
Community Member

Re: How to block the SMTP port 25 on Cisco router

hi

Use an accesslistvto handle it

Something like this

Conf t

Access-list 150 deny tcp any any eq smtp

Access-list 150 permit ip any any

Then apply it on the interface

Int x

Access-group 150 in ( or out depending n your prefs)

Rgds

Matt

Sent from Cisco Technical Support iPad App

Community Member

Re: How to block the SMTP port 25 on Cisco router

Hello Douhanm,

I don't want to block it totally, i need a dynamic rule that will block it from like 12 hours when it detect spam activity.

thanks

N W
Community Member

Re: How to block the SMTP port 25 on Cisco router

Hi

I think your best looking at Cisco Ironport anit-spam. I would not use a router for anit-spam whatsoever.

Noel

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