Recent Changes to BCL?

Question

Over the past few days, we have seen our BCL values go from a 0 to a 5 on multiple sending domains. Some of the domains we own, and some we do not. Some of the domains are well known content senders. Have any changes been made recently that would have caused a larger than expected jump in BCL values?

Answer 1

Hi @ Mark Konwinski ,

Microsoft uses both internal and third-party lists to identify bulk mail and determine the appropriate BCL. And I didn't find an update on the BCL changes.

Therefore, if you are unable to receive bulk messages from certain senders due to BCL changes, you can refer to this link to adjust the bulk threshold in your anti-spam policy：

What's the difference between junk email and bulk email? - Office 365 | Microsoft Learn

Or admins can submit the sender's messages to Microsoft for analysis, which adds the sender as an allow entry in the Tenant Allow/Block List.

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