Using the feature described in this article requires that you first set up the free Cloud Protection Layer service with your Barracuda Email Security Gateway. See Cloud Protection Layer for more information about the service.
You can select to Block messages based on country of origin on the Inbound Settings > Regional Policies page, allowing you to reduce unwanted Inbound emails. Note that this setting applies to all domains you have verified in the Cloud Protection Layer for processing email, unless you change these settings for a specific domain. In that case, the domain-level settings override the global system settings.
Once you select a country from the drop-down menu and click Add, the ISO code for the selected country displays in the table. For a complete list of country codes, see Country Codes List.
When bulk editing countries for regional policies, use the ISO 3166 alpha 3 code. See the ISO Online Browsing Platform (OBP): https://www.iso.org/obp/ui/#search