Microsoft: Exchange Online bug mistakenly quarantines user emails

Microsoft is investigating an Exchange Online bug causing anti-spam systems to mistakenly quarantine some users' emails. According to a new incident report added to the Microsoft 365 Admin Center, the email issues started almost five hours ago, at 10:11 UTC. While the company has yet to share what regions are impacted, this Exchange Online incident has been tagged as a critical service issue tracked under EX1038119 on the Microsoft 365 admin center. "Specific URLs are being miscategorised and quarantined by our anti-spam systems, causing impact," said Microsoft describing the root cause. "Some users' Exchange Online email messages may be unexpectedly quarantined." "Efforts to alleviate impact by adding the affected URLs to the appropriate allow list have so far been unsuccessful. We're attempting to manually correct affected email message locations to remediate impact while we review for more offending URLs," the company added. Redmond's engineers are also tracking a separate inci ... Read full article.