Blocking traffic by Country to reduce spam

[paavan.shah () gmail com]

Hello List,

One of our clients is based in USA and has most of the business in USA and UK.

To reduce spam we are planning to propose them a solution to filter traffic by country.

We can add IP Blocks for USA and UK as a whitelist and allow only incoming access to those IP Blocks,everything else is 
blocked.

Has anyone implemented this change on their production networks?Has it been effective to reduce spam?

Please share your views and experiences

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