Security | Threat Detection | Cyberattacks | DevSecOps | Compliance

Organizations investing in Microsoft 365 E5 licensing expect enterprise-grade email protection. Yet despite premium security features, customer feedback reveals persistent challenges with Microsoft Purview DLP across Exchange Online environments. Microsoft deployment specialists report seeing clients deploy Purview on their own, discover a wealth of false positives, and turn off the policies or set them to audit mode. Policies never become useful.

In our previous blog (Beyond Attachments: How Email Becomes Your Biggest Data Exfiltration Vector), we exposed the critical gaps in standard email data loss prevention (DLP) tools that allow data exfiltration to continue despite significant investment in native controls. Organizations that have implemented targeted solutions to address these gaps report dramatic improvements in their security posture. Here's what comprehensive email DLP actually looks like in practice.

Your Microsoft 365 and Google Workspace security dashboards show green across all metrics. You've implemented data loss prevention policies, enabled advanced threat protection, and your team regularly audits security logs. Yet sensitive data continues to leave your organization through email channels. Why? Because attackers and even non-malicious insiders aren't using the obvious exfiltration techniques your tools were built to detect.

How should data security teams walk the fine line between enabling AI innovation, safeguarding sensitive data, and ensuring compliance? That question drives everything we build at Nightfall. It’s also an excellent jumping off point for an in-depth discussion among security experts.

The rapid adoption of AI, particularly generative AI tools like ChatGPT and Copilot, presents both immense productivity opportunities and significant data security challenges for organizations. While employees increasingly leverage AI for various business functions, this widespread use often occurs outside sanctioned channels, creating what's known as shadow AI.