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The Cisco Email Security Appliance (ESA) is powered by Cisco Security Intelligence Operations (SIO), this industry-leading threat intelligence organization.
Cisco SIO detects and correlates threats in real time using the largest threat detection network in the world. It monitors 100 TB of daily security intelligence, 1.6 million deployed security devices, 13 billion daily web requests, and 35 percent of worldwide email traffic.
Cisco SIO prevents zero-hour attacks by continually generating new rules that feed updates to the Cisco ESA. These updates occur every 3-5 minutes to provide industry-leading threat defense, hours and even days ahead of competitors.