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.
Applies to: Exchange Online · Microsoft Defender XDR
Source: mc.merill.net — data via Merill Fernando's open archive (MIT).