What are two benefits to deploying a threat-monitoring appliance for SMTP traffic? (Choose two.)

What are two benefits to deploying a threat-monitoring appliance for SMTP traffic? (Choose two.)
A . Email content security appliances detect malware and detonate it in a sandbox environment for further analysis.
B . Email content security appliances allow Snort rules to trigger system administrator alerts.
C . Email content security appliances can filter sensitive outbound email.
D . Reputation-based filtering can be deployed to filter a large percentage of spam email.
E . Email content security appliances establish secure tunnels between end-user email clients and the SMTP server, reducing the need for email authentication.

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Answer: CD