DLP (Data Loss Prevention) is a security service that is configured only through an outgoing mail policy on Cisco ESA. DLP allows Cisco ESA to scan outgoing messages for sensitive or confidential data, such as credit card numbers, social security numbers, health records, etc., and apply appropriate actions, such as encrypt, quarantine, notify, etc., to prevent data leakage or loss.
References: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 9-2.
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