Microsoft fixes machine learning bug flagging Adobe emails as spam

Microsoft says it mitigated a known issue in one of its machine learning (ML) models that mistakenly flagged Adobe emails in Exchange Online as spam. As the company revealed in an advisory on the Microsoft 365 admin center tagged as EX1061430, users had issues accessing alerts for Adobe URLs starting April 22 at 09:24 UTC while being warned that a potentially malicious URL click had been detected. This type of alert is usually issued when Exchange Online users click a link in an email that is later found to be malicious. "We've determined our machine learning (ML) model, which safeguards Exchange Online against risky email messages, was incorrectly identifying legitimate email messages as spam due to their similarity to email messages used in spam attacks, which was resulting in impact," Microsoft said. "To fix the issue we initiated Replay Time Travel (RTT) on the affected URLs to fully remediate impact. Impact was specific to some users who were served through the affected infras ... Read full article.