Overview

You have begun receiving unexpected spam emails and require guidance on enabling or configuring the Kerio Anti-Spam extension settings of your Kerio Connect server. 

Solution

The Kerio Anti-spam extension uses the Bitdefender online scanning service. It provides an advanced level of spam filtering for incoming messages. In Kerio Connect 9.0.3-9.1.1, Kerio Anti-spam replaced the SpamAssassin's SURBL and Bayes filters. Starting in version 9.2, you can use Kerio Anti-spam together with Apache SpamAssassin to provide more robust spam protection.

Kerio Anti-spam is available as a paid add-on. Without Kerio Anti-spam, you can still use the standard anti-spam features in Kerio Connect. See Kerio Connect Anti-Spam Filters for more information about each of the available Anti-Spam options, how they interact together, and guidance on fine-tuning their settings.

1. In the administration interface, go to Configuration > Content Filter > Spam Filter.

2. Switch to the Kerio Anti-spam tab.

3. Select Enable Kerio Anti-spam advanced filter.

4. Set the Contribution to spam rating. The value of the setting affects only spam messages:

   • If SpamAssassin is disabled, you can set the Kerio Anti-spam settings (Filter contribution to overall spam score) to 2-18.

     

   • If SpamAssassin is enabled, you can set the Kerio Anti-spam settings (Filter contribution to overall spam score) to 1-9.

     

     NOTE: In Kerio Connect 9.1.0 and 9.1.1, you can set this value to moderate = 6, normal = 10, high = 14. In Kerio Connect 9.0.3 and 9.0.4, this value also affects non-spam messages: moderate = 1, normal = 2, high = 3.
5. Optional: To allow Bitdefender to save the encrypted data from Kerio Connect, select the Allow signatures and metadata to be utilized for enhancing the online scanning service.
   
   NOTE: In Kerio Connect 9.0.3-9.1.1, select Allow the use of spam and Allow the use of non-spam options.
   Bitdefender saves only the encrypted data, not the entire messages.
   
   
   
   

Troubleshooting

If you are upgrading from a previous version, restart Kerio Connect after you enable Kerio Anti-spam. If any problem with Kerio Anti-spam occurs, consult the Debug log article.

1. Right-click in the Debug log area, and click Messages.

2. Select the Kerio Anti-spam Processing, SpamAssassin Processing, and Spam filter options.
   
   

   NOTE: After debugging, clear those options. Otherwise, the logging may slow down server performance.