D for sure
Cisco ESA uses a multilayer approach to fight viruses and malware:
• The first layer of defense consists of outbreak filters, which the appliance downloads from Cisco
SenderBase. They contain a list of known bad mail servers. These filters are generated by watching
global email traffic patterns and looking for anomalies associated with an outbreak. When an email is
received from a server on this list, it is kept in quarantine until the antivirus signatures are updated to
counter the current threat.
• The second layer of defense is using antivirus signatures to scan quarantined emails, to ensure that they
do not carry viruses into the network.
• Cisco ESA also scans outbound emails to provide antivirus protection.
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