6.7 Spam filter
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## 6.7 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. Use the Tools → Options menu on the Spam tab (see figure 6.21 The Junk E-mail tab) to enable/disable displaying of the warning message.

### 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).

### 6.7.1 The Spam tab

The Spam tab provides several tools to fight spam:

Figure 6.21. The Junk E-mail tab

Confirm marking mail message as spam

  This option enables/disables alert window displayed upon clicking on the Spam button which is available in the toolbar.

Move spam to the Junk E-mail folder

  If this option is enabled, all email considered as spam will be delivered to the Junk E-mail folder automatically.

  Note: The Move spam to the Junk E-mail folder rule beats rules for incoming mail (see chapter 6.6 Rules for incoming messages). If the filter includes any rule which in any way handles messages marked as spam, the action set in this rule is ignored.

  This option also enables adding email addresses to the list of trustworthy users (see below).

Also trust senders from ...

  So called Spam whitelist In this list, senders that will automatically be considered as non-spammers can be added/removed.

  A new email address can be added in the Add e-mail address entry. This address must be specified in the `username@domain` format.

Also trust senders from my Contacts folder

  If this option is enabled, messages marked as spam which were sent from addresses included in the default contact folder are not moved to the Spam folder automatically.

  This option supposes that email addresses in one's contact list are trustworthy. If this option is enabled, it is not necessary to include addresses saved in the default Contact folder in the whitelist.

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6.6 Rules for incoming messages | Contents | 6.8 Address books and contacts