A benefit of implementing URL filtering on the ESA is that it provides URL reputation protection. URL filtering uses SenderBase, a web-based service that collects information about URLs and domains from various sources, to assign a reputation score and a category to each URL. Based on these attributes, you can configure content or message filters to take actions on messages containing malicious or undesirable URLs.
References: User Guide for AsyncOS 12.0 for Cisco Email Security Appliances - GD (General Deployment), Chapter: Protecting Against Malicious or Undesirable URLs, Section: URL-Related Protections and Controls
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