Cisco Cisco Email Security Appliance C170

Outbreak Filters - Outbreak Filters uses the Context Adaptive Scanning Engine to determine the threat 
level of a message and scores messages based on a combination of Adaptive Rules and Outbreak Rules. 
In some configurations, you may experience a moderate performance decline.

IronPort Spam Quarantine - Enabling the IronPort Spam Quarantine on-box for a C-Series or X-Series 
appliance causes a minimal reduction in system throughput for nominally loaded appliances. For 
appliances that are running near or at peak throughput, the additional load from an active quarantine may 
cause a throughput reduction of 10-20%. If your system is at or near capacity, and you desire to use the 
IronPort Spam Quarantine, consider migrating to a larger C-Series appliance or an M-Series appliance.

If you change your anti-spam policy from dropping spam to quarantining it (either on-box or off-box), 
then your system load will increase due to the need to scan additional spam messages for virus and 
content security. For assistance in properly sizing your installation please contact your authorized 
support provider.

The User Guide PDF may be more current than the online help. To obtain the User Guide PDF and other 
documentation for this product, click the View PDF button in the online help or visit the URL shown in 

. 

Information about other resources, including the knowledge base and Cisco support community, is in the 
online help and the User Guide PDF. 

The criteria for evaluating a file’s reputation and for sending files for analysis may change at any time. 
Criteria are available only to registered Cisco customers. See File Criteria for Advanced Malware 
Protection Services for Cisco Content Security Products, available from 

http://www.cisco.com/c/en/us/support/security/email-security-appliance/products-user-guide-list.html

In order to access this document, you must have a Cisco customer account with a support contract. To 
register, visit https://tools.cisco.com/RPF/register/register.do. 

AsyncOS is designed to automatically deploy and update the certificates needed for communications 
with cloud services used for URL filtering features. However, if for any reason the system is unable to 
update these certificates, you will receive an alert that requires action from you. 

To ensure that you receive these alerts (System type, Warning severity), see information in the online 
help or user guide about adding alert recipients. 

If you receive an alert about an invalid certificate, contact Cisco TAC, which can provide the required 
replacement certificate. Instructions for installing the certificate are in the URL Filtering chapter in the 
online help or user guide. 

For details about the connection between the appliance and the cloud URL reputation and category 
services, see the URL Filtering chapter of the user guide or online help.