Cisco Cisco Email Security Appliance X1070 Guía Del Usuario
C H A P T E R
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Cisco AsyncOS 8.5 for Email User Guide
15
URL Filtering
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Overview of URL Filtering
URL filtering uses the reputation and category of each URL link in incoming and outgoing messages
(excluding attachments) to:
(excluding attachments) to:
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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.
organization already has a Cisco Web Security Appliance or similar protection from web-based
threats, as it blocks threats at the point of entry.
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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.
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.
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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.
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.
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.
system prioritizes screening of incoming messages over outgoing messages.
Which URLs Are Evaluated
Any valid string for a URL is evaluated, including strings with the following:
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http:// or https://, but not “www.example.com” without either prefix