To further protect your organization against spam, you can use SPF (Sender Policy Framework) technology or Reputation Filtering.

SPF technology

A technology that checks authenticity of the sender's domain. Using SPF, domains allow certain computers to send mail on its behalf.

To enable the use of SPF technology, select the Check SPF record check box. For instructions, see Online Help. A message's spam rating will be increased if the sender is not on the list of approved senders.

Reputation Filtering service

Reputation Filtering increases the accuracy of spam detection. If the Use Reputation Filtering check box is selected (see Online Help for instructions), the application moves messages requiring additional scanning to a special temporary storage area named Quarantine. During 50 minutes, the application scans the message again using additional information received from Kaspersky servers.

If the application fails to detect spam, contact Anti-Spam Lab. See this article for instructions.

We also recommend that you submit a request to Kaspersky Technical Support via Kaspersky CompanyAccount. Please include a detailed description of the issue. In your request, provide the following:

• Multiple emails that were not detected as spam (5-10 different samples). First, export them from user mailboxes. Then add them to an archive with the password infected.
• All logs collected by KseInfoCollector tool from the server that processed these samples and on which Kaspersky Security for Microsoft Exchange Servers is installed. See this article for instructions.

Kaspersky Technical Support requires these samples and logs to analyze spam detection settings and critical errors in the application’s event logs.