You would first need to either have purchased a hardware Email Security Appliance (ESA) or Virtual Email Security Appliance (vESA). You'll need to reach out to a reseller or Cisco Sales to initiate any purchasing solutions that is applicable for you. Please see the following site for main information:
http://www.cisco.com/c/en/us/products/security/email-security-appliance/index.html
I hope this helps!
-Robert
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