Your organization is implementing a data loss prevention (DLP) policy to prevent sensitive data from being shared via email. Users in the finance department need to send financial reports to external auditors. What should you configure?
Trap 1: Add the auditors' domains to a DLP allow list
Adding auditors' domains to a DLP allow list is not a standard or effective configuration within Microsoft Purview Data Loss Prevention. DLP policies primarily operate by inspecting content for sensitive information types and applying actions based on policy rules, rather than relying on domain-based whitelisting to bypass these content-centric controls. While mail flow rules (transport rules) in Exchange Online can utilize sender/recipient domain allow lists for email routing or processing, DLP policies are designed for granular content protection and do not typically offer a direct 'allow list' mechanism for policy exceptions based solely on external domains.
Trap 2: Assign a sensitivity label that automatically encrypts the email
Assigning a sensitivity label that automatically encrypts the email primarily focuses on data classification and protection, ensuring that the content remains secure even if it leaves the organization's control. While sensitivity labels are crucial for data governance and can enforce encryption, they do not inherently provide the 'override with justification' capability that a DLP policy offers for user-driven exceptions to sharing rules. Their function is to apply persistent protection based on content classification, not to manage conditional sharing exceptions with an audit trail for user justification.
Trap 3: Configure a DLP policy with a block action for all external sharing
Configuring a DLP policy with a block action for all external sharing would be overly restrictive and detrimental to legitimate business operations. While blocking is a powerful DLP action, applying it universally would prevent necessary collaboration with external partners, customers, and, in this scenario, auditors, hindering productivity and operational efficiency. Effective DLP strategies require granularity, allowing for specific exceptions or user overrides with justification rather than implementing a blanket ban that impedes essential business processes.
- A
Add the auditors' domains to a DLP allow list
Why wrong: Adding auditors' domains to a DLP allow list is not a standard or effective configuration within Microsoft Purview Data Loss Prevention. DLP policies primarily operate by inspecting content for sensitive information types and applying actions based on policy rules, rather than relying on domain-based whitelisting to bypass these content-centric controls. While mail flow rules (transport rules) in Exchange Online can utilize sender/recipient domain allow lists for email routing or processing, DLP policies are designed for granular content protection and do not typically offer a direct 'allow list' mechanism for policy exceptions based solely on external domains.
- B
Configure a DLP policy with an override option allowing users to justify the sharing
Configuring a DLP policy with an override option that allows users to justify sharing is the most appropriate solution for balancing security with legitimate business needs. This feature enables organizations to enforce strong data protection while providing a controlled mechanism for users to temporarily bypass a policy when a valid business reason exists, such as sharing specific audit-related documents externally. The justification provided by the user is logged, creating an essential audit trail for compliance and review, ensuring accountability without completely blocking necessary collaboration.
- C
Assign a sensitivity label that automatically encrypts the email
Why wrong: Assigning a sensitivity label that automatically encrypts the email primarily focuses on data classification and protection, ensuring that the content remains secure even if it leaves the organization's control. While sensitivity labels are crucial for data governance and can enforce encryption, they do not inherently provide the 'override with justification' capability that a DLP policy offers for user-driven exceptions to sharing rules. Their function is to apply persistent protection based on content classification, not to manage conditional sharing exceptions with an audit trail for user justification.
- D
Configure a DLP policy with a block action for all external sharing
Why wrong: Configuring a DLP policy with a block action for all external sharing would be overly restrictive and detrimental to legitimate business operations. While blocking is a powerful DLP action, applying it universally would prevent necessary collaboration with external partners, customers, and, in this scenario, auditors, hindering productivity and operational efficiency. Effective DLP strategies require granularity, allowing for specific exceptions or user overrides with justification rather than implementing a blanket ban that impedes essential business processes.