1. Log into the webadmin interface

2. In the "Security & Filtering" context open the "Additional AntiSpam Methods" page

3. In the "DNSBL" section, click the "Add DNS Blacklist" button.

4. Provide a name for the Blacklist (the name of the provider is recommended).

5. Enter the black list operator's DNS server, or the provided settings to query the blacklist (for example: bl.operator.tld).

6. Click the "Quick Add" button.

7. Click the "Save Configuration" button to make the changes permanent.

NOTE: You can set up exceptions for the blacklist look-ups using the "Add IP/Range" button below the blacklist definition area.

NOTE: This rule will not be applied for authenticated users.