Cisco Email Security Appliance

Industry-Leading Email Protection

Keep your critical business email safe from spam, malware, and other threats. Our industry-leading solution gives you faster, more complete email protection to stop email-based threats and provide continuous protection before, during, and after an attack.


Stay Ahead of Advanced Threats

Cisco Email Security Appliance protects your network around the clock. (3:27 min)

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3 Ways to Try Email Security Free

See how it works through 45-day evaluations, daily webinars, and instant demonstrations.

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Features and Capabilities

Industry-Leading Performance

Cisco ESA offers:

  • The capability to quickly block new email-based blended attacks
  • Best-in-class capability to control or encrypt sensitive outbound email
  •  A superior spam capture rate (more than 99 percent) and few false positives (less than one in one million)
  • The industry's first proven zero-hour antivirus solution 

Investment Value

Cisco ESA provides:

  • Easy installation and management
  • Low network impact
  • Less ongoing administration  
  • 10 JD Powers award-winning security support centers globally, with 24-hour support

Continuous Innovation

  • Demonstrated commitment to email security investment and innovation
  • Flexible deployments: on-premises, cloud, hybrid, and virtual deployments
  • Superior ability to scale threat analysis as global data explodes

Real-Time Threat Intelligence

The Cisco Email Security Appliance (ESA) is powered by the Cisco Talos Security Intelligence and Research Group (Talos). Its threat intelligence detects, analyzes, and protects against both known and emerging threats. It accomplishes this by aggregating and analyzing Cisco's extensive telemetry data including:

  • Billions of web requests and emails
  • Millions of malware samples
  • Open source data sets
  • Millions of network intrusions

Talos offers a holistic understanding of threats, their root causes, and scopes of outbreaks. Cisco Email Security products are dynamically updated with this information every 3-5 minutes, resulting in superior email protection. 

Specifications at a Glance

Deployment Model Description
Large enterprise Cisco ESA C680 High-performance, comprehensive security at the network gateway for service providers and large-scale enterprise email systems.
Midsize enterprise Cisco ESA C380 Built on the latest generation of appliance hardware.
Small to midsize businesses or branch offices Cisco ESA C170 Cost-effective email security designed for small businesses, branch offices, and organizations with fewer than 2000 users.*

*For accurate sizing, verify your choice by checking the peak mail flow rates and average message size with a Cisco content security specialist.

Product Support Services

Cisco Services can help you increase operational efficiency, lower support costs, and improve availability risk management.


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Additional Resources

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