Microsoft fixes Exchange Online bug flagging Gmail emails as spam

​Microsoft has resolved an issue with a machine learning model that mistakenly flagged emails from Gmail accounts as spam in Exchange Online. Tracked as EX1064599 in the Microsoft 365 admin center, the issue started impacting users on April 25 at 09:24 UTC, automatically moving emails erroneously tagged as malicious to the junk folder. "We've identified that our machine learning (ML) model, which safeguards Exchange Online against risky email messages, is incorrectly identifying legitimate email messages as spam due to their similarity to email messages used in spam attacks, which is resulting in impact," the company explained when it acknowledged the ML model bug. In a final update to the incident report added on May 1 at 16:31 UTC, Microsoft said it successfully reverted the buggy ML model to the previous working version, mitigating the false positive issue. It also added that admins and users may have also been able to create custom allow rules to ensure that Gmail messages weren ... Read full article.