5.8 Spam filter
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## 5.8 Spam filter

Kerio MailServer contains the SpamAssassin antispam filter. SpamAssassin is based on content analysis (spam messages usually contain specific attributes that can be searched for and evaluated by the filter). Each message is assigned a numeric score; if this value exceeds the limit set in Kerio MailServer, the message is marked as spam.

The spam filter may let some spam messages through from time to time by mistake (their score is low) and mark some regular messages as spam (their score is too high). For the reasons above, the antispam filter allows modification to the database used for recognition of spam messages. This method, however, requires user input. Users have to reassign the incorrectly evaluated messages to correct types (spam / non-spam) so that the filter learns to recognize them in the future.

Kerio Outlook Connector uses the Spam and Not spam buttons located in the toolbar to mark the messages correctly. Highlight the incorrectly marked message and click one of the buttons. The filter receives information regarding update of the database. This decreases chance for incorrect deliveries.

You can add the Spam and Not spam buttons to the toolbar in Tools → Customize menu or remove them. The Toolbars tab includes the Kerio Outlook Connector option. Simply select or unselect it by clicking to enable/disable the bar with the buttons.

The Spam button displays a warning message by default. To treat the message as spam and discard it, a confirmation is required. To enable/disable warning alerts, go to the Tools → Options menu on the Kerio MailServer tab.

### Warning

If the Spam/Not Spam buttons are not available after installation or startup of MS Outlook, it is necessary to remove Kerio Outlook Connector from all forbidden items of MS Outlook (see chapter 6.13.1 Spam/Not Spam buttons displaying problems).

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5.7 Rules for incoming messages | Contents | 5.9 Grouping and searching of messages