At BlackSun, we take advantage of a comprehensive up-to-date data on new threats to filter messages that have been scanned minutes or even hours ago.
Cloudmark's ActiveFilter technology enables service providers act upon false negatives after messages have been delivered. How is this possible? ActiveFilter takes advantage of the
unique capability of Cloudmark's Advanced Message Fingerprinting algorithms to reduce each message to a small set of fingerprints that doesn't change over time. It keeps a cache of these fingerprints along with other data as each message is scanned. When new fingerprints are identified as spam or virus by the Cloudmark Global Threat Network™, ActiveFilter checks to see if any messages in the cache include these "spammy" fingerprints. If it does then ActiveFilter notifies BlackSun's servers to take action on these recently-discovered threats.
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How ActiveFilter Works
Cloudmark simply changes the classification of an existing fingerprint from legitimate to spam or virus. Since service providers only need to take targeted action on individual messages that have changed classification, there's little impact on resources.