Which feature of the Cisco Email Security Appliance can mitigate the impact of snowshoe spam and
sophisticated phishing attacks?

A.
contextual analysis

B.
holistic understanding of threats

C.
graymail management and filtering

D.
signature-based IPS

Explanation:
BD
Snowshoe spamming is a strategy in which spam is propagated over several domains and IP addresses to
weaken reputation metrics and avoid filters. The increasing number of IP addresses makes recognizing and
capturing spam difficult, which means that a certain amount of spam reaches their destination email inboxes.
Specialized spam trapping organizations are often hard pressed to identify and trap snowshoe spamming via
conventional spam filters.
The strategy of snowshoe spamming is similar to actual snowshoes that distribute the weight of an individual
over a wide area to avoid sinking into the snow. Likewise, snowshoe spamming delivers its weight over a wide
area to remain clear of filters.
Source: https://www.techopedia.com/definition/1713/snowshoe-spamming
Snowshoe spam, as mentioned above, is a growing concern as spammers distribute spam attack origination
across a broad range of IP addresses in order to evade IP reputation checks. The newest AsyncOS 9 for ESA
enables enhanced anti-spam scanning through contextual analysis and enhanced automation, as well as
automatic classification, to provide a stronger defense against snowshoe campaigns and phishing attacks.
Source: http://blogs.cisco.com/security/cisco-email-security-stays-ahead-of-current-threats-by-adding-strongersnowshoe-spam-defense-amp-enhancements-and-more