Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

URL filtering uses the reputation and category of each URL link in incoming and outgoing  messages 
(excluding attachments) to: 

Increase the effectiveness of protection from malicious URLs in messages 

URL filtering strengthens the protection offered by Outbreak Filters, and is useful even if your 
organization already has a Cisco Web Security Appliance or similar protection from web-based 
threats, as it blocks threats at the point of entry. 

Better identify spam 

The appliance uses the reputation and category of links in messages, in conjunction with other 
spam-identification algorithms, to help identify spam. For example, if a link in a message belongs 
to a marketing web site, the message is more likely to be a marketing message. 

Support enforcement of corporate acceptable use policies 

The category of URLs (for example, Adult Content or Illegal Activities) can be used in conjunction 
with content and message filters to enforce corporate acceptable use policies. 

URL filtering is incorporated into the anti-spam, outbreak, content, and message filtering processes in 
the workqueue. 

If necessary for load management, when evaluating URLs to determine whether a message is spam, the 
system prioritizes screening of incoming messages over outgoing messages. 

Any valid string for a URL is evaluated, including strings with the following: 

http:// or https://, but not “www.example.com” without either prefix