Countries.nerd.dk Definition Generator

What is This?

This tool allows you to blacklist emails based on their source country, by generating an ORF DNS Blacklist definition for the countries.nerd.dk IP-to-country DNS blacklist.

Are There Any Risks Using This Blacklist?

Certainly, yes. While blacklisting certain countries may help against spam, you can also lose legitimate emails—for instance, global companies with multiple branches all over the globe may send you emails from countries you would never expect.

Using the Blacklist Definition Generator

Add countries to your blacklist by checking the boxes next to them. Click the "Check All" buttons to blacklist an entire continent at once. When finished selecting the countries, click the "Download" button and import the resulting DNS Blacklist definition in ORF.

^[1] Our company, Vamsoft Ltd. is located in Hungary. Make sure you have the "Whitelist emails from Vamsoft Ltd. email server address" checkbox checked in Configuration / Tests / IP Whitelist to avoid blacklisting us if you decide to blacklist our country.

^[2] As of writing this, countries.nerd.dk does not have unique response codes for Serbia, Montenegro and Kosovo yet, so blacklisting Yugoslavia will blacklist all three countries at once.

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SMTP Response Configuration

Customize the Before Arrival SMTP response (see "SMTP Responses" in the ORF Help index) below. In the case of this DNS Blacklist, we recommend that you include backup contact information (e.g. whitelisted email address or phone number), so that no email is lost due to country blacklisting.

You can use ORF format fields in curly brackets (see list). The field #COUNTRYNAME# will be replaced with the name of the country the email came from.

Getting The DNS Blacklist Definition

Click button "Download" to get the DNS Blacklist definition file that can be imported in ORF.

Importing the Definition File

Import the definition

Start the ORF Administration Tool.
Select Configuration / Tests / DNS Blacklists from the administration tree on the left.
Right-click on the list and select Import Blacklist Definitions.
Select the countries.nerd.dk.xml file that you downloaded.
Uncheck the Delete current definitions not listed here (full overwrite) checkbox and click OK.
Check the box for nerd.dk Country Blacklist in the DNSBL list.

Save the configuration changes

Select Configuration | Save and Update Configuration from the menu to update the configuration.