Exchange Online Protection: Bulk Filter (BCL) Improvements
Exchange Online Protection (EOP) is making changes to how it assigns a bulk complaint level (BCL) to inbound messages from bulk mailers. These changes include more accurate scoring and coverage for bulk messages and an updated threshold for the strict policy from 4 to 5. Additionally, customers using Microsoft Defender for Office P2 or customers with E5 licenses will be able to view the BCL score for a message in advanced hunting. The rollout is expected to begin in mid-November and end by late January 2023, and it is not expected to impact users. However, in cases where the threshold is 4 or less, legitimate bulk messages may be classified as unwanted, so administrators are encouraged to check their Antispam policies and adjust the BCL value accordingly.
For more information on how to adjust your tenant's bulk thresholds and tune your Antispam policies, see the official documentation.
The post Exchange Online Protection: Bulk Filter (BCL) Improvements originally appeared on M365 Admin.
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