User Impact - Users' outbound Exchange Online email messages may have been incorrectly flagged as spam.
More info - Impact was specific to senders protected by the default outbound spam policies.
Admins may have received copies of the flagged email messages.
Scope of Impact - Any user attempting to send outbound Exchange Online email messages was impacted.
Root Cause - A recent change to our model for filtering outbound email messages as spam caused impact.
Next Steps - A recent change to our model for filtering outbound email messages as spam caused impact.
Dec 4, 2024, 5:22 PM CST We've disabled our recent changes to the model for filtering outbound email messages as spam and confirmed through our mail filtering telemetry that the impact is remediated.