Cisco Cisco Email Security Appliance C160 Guía Del Usuario
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Cisco AsyncOS 8.5 for Email User Guide
Chapter 1 Getting Started with the Cisco Email Security Appliance
What’s New in This Release
URL filtering
URL filtering obtains the reputation and category of URLs in incoming and
outgoing messages to allow several new functionalities:
outgoing messages to allow several new functionalities:
•
Anti-spam and outbreak filters now use the reputation and category of URLs in
messages to help determine if a message is spam or malicious. This additional
data improves the filtering accuracy for messages that contain URLs.
messages to help determine if a message is spam or malicious. This additional
data improves the filtering accuracy for messages that contain URLs.
•
You can further reduce the threat from potentially malicious sites by modifying
URLs in delivered messages. You can make URLs unclickable, replace them
with text, or redirect them to a proxy that evaluates the safety of a site if and
when the recipient clicks the link, and blocks transactions it deems unsafe.
URLs in delivered messages. You can make URLs unclickable, replace them
with text, or redirect them to a proxy that evaluates the safety of a site if and
when the recipient clicks the link, and blocks transactions it deems unsafe.
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You can create content and message filters to modify URLs based on
categories of URL that are likely to be problematic.
categories of URL that are likely to be problematic.
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You can configure mail policies to modify URLs found in suspected spam.
•
You can create content and message filters to enforce acceptable use policies
based on the category of URLs in messages. For example, you can drop
messages that include links in the Illegal Activities category.
based on the category of URLs in messages. For example, you can drop
messages that include links in the Illegal Activities category.
For more information, see
Stochastic
sampling
sampling
From AsyncOS 8.5 for Email and later, if IronPort Anti-Spam or Intelligent
Multi-Scan feature keys are active and SenderBase Network Participation is
enabled, AsyncOS sends a random sample of messages to CASE for Antispam
scanning, irrespective of their sender's SBRS. CASE scans these messages and uses
the results to improve the efficacy of the product.
Multi-Scan feature keys are active and SenderBase Network Participation is
enabled, AsyncOS sends a random sample of messages to CASE for Antispam
scanning, irrespective of their sender's SBRS. CASE scans these messages and uses
the results to improve the efficacy of the product.
Enhancements
Spam quarantine
improvements
improvements
•
You can now choose whether to require end users to log in when they access
the end user quarantine via a link in a notification.
the end user quarantine via a link in a notification.
For more information, see
•
You have more flexibility in scheduling the frequency and timing of
notifications sent to end users about possible spam they receive. For example,
you can now send notifications any day or days of the week and any hour or
hours of the day.
notifications sent to end users about possible spam they receive. For example,
you can now send notifications any day or days of the week and any hour or
hours of the day.
•
Administrators can now view, search, add, edit, and delete safelist and blocklist
entries.
entries.
For more information, see
Feature
Description