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Microsoft Exchange: Improved bulk detection and updated bulk complaint level recommendations
Microsoft Exchange is enhancing bulk email filtering with recalibrated bulk sender distribution across different bulk complaint levels (BCL). New BCL recommendations are 7 for default and standard, and 5 for strict policies. Rollout starts mid-October 2024, with completion by mid-November 2024. Admins should adjust BCL settings accordingly.
Microsoft Exchange is enhancing bulk email filtering with recalibrated bulk sender distribution across different bulk complaint levels (BCL). New BCL recommendations are 7 for default and standard, and 5 for strict policies. Rollout starts mid-October 2024, with completion by mid-November 2024. Admins should adjust BCL settings accordingly.
As part of ongoing improvements to bulk email filtering in Microsoft Defender for Office | Exchange Online Protection, we are refining our detection capabilities by recalibrating and redistributing bulk senders across different bulk complaint levels (BCL). This would automatically make the current bulk thresholds slightly more aggressive. As a consequence, we are updating bulk threshold for standard preset policy to 7 from current value of 6. In response to general customer feedback around receiving more bulk email, we are keeping current default BCL threshold of 7 in default policy as is. Here’s what’s changing:
- Redistribution for aggressive filtering: The new BCL distribution makes higher levels as aggressive as lower levels in previous version, enabling more precise targeting of unwanted bulk emails.
- Updated BCL recommendations: The new recommended settings are 7 for default and standard, and 5 for strict to improve control over bulk filtering (replacing the previous levels of 7, 6, and 5).
Learn more: Bulk complaint level values – Microsoft Defender for Office 365 | Microsoft Learn (will be updated before rollout)
Message ID: MC913443
