How to block spam that would be sent out from our source IP?

heangsokdet · ‎06-23-2009

Hello,

I would like to filter spam not to be sent from GPRS users that use our source IP addresses to Internet. I am using Cisco router 2821 as GPRS gateway and router 7206 as our Internet gateway. Does anyone know how to filter spam outgoing from source IP? I would be appreciate for help.

Thanks,

Det

mmacdonald70 · ‎06-29-2009

Why not just use an access-list to block outgoing port 25?

Kureli Sankar · ‎06-29-2009

Using an acl will block all e-mails and not just the spam.

You need a content scanning device like a CSC module is on an ASA to scan the contents of any e-mail before sending it out.

In case of a 2811 router here is the link:

http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6643/prod_qas0900aecd804abb06.html