Use DLP Assist for M365
Cloudflare Email security customers who have Microsoft 365 environments can quickly deploy an Email DLP (Data Loss Prevention) solution for free.
Simply deploy our add-in, create a DLP policy in Cloudflare, and configure Outlook to trigger behaviors like displaying a banner, alerting end users before sending, or preventing delivery entirely.
Refer to Outbound Data Loss Prevention to learn more about this feature.
In GUI alert:

Alert before sending:

Prevent delivery:

This feature is available across these Email security packages:
- Enterprise
- Enterprise + PhishGuard