"In a service alert spotted by BleepingComputer, Microsoft revealed that the glitch started on February 5 and has been preventing some Exchange Online users from sending and receiving emails. "Some users' legitimate email messages are being marked as phish and quarantined in Exchange Online," Microsoft said in the service alert. "We've determined that the URLs associated with these email messages are incorrectly marked as phish and quarantined in Exchange Online due to ever-evolving criteria aimed at identifying suspicious email messages, as spam and phishing techniques have become more sophisticated in avoiding detection.""
"Microsoft has made some progress in resolving the issue. At this point, some users may see previously quarantined emails start to appear in their inboxes. But other messages will remain quarantined until the problem is completely fixed. If you do use Exchange Online and are affected by this bug, you may want to check your quarantined emails to see if any legitimate ones are waiting for you. To do this, head to the Quarantine page for Microsoft Defender and make sure you're signed in with your work or school account. If you spot a message that's legit, just check it"
Exchange Online began quarantining some legitimate emails as phishing starting February 5, preventing affected users from sending and receiving messages. The root cause is a new URL rule that is incorrectly identifying certain legitimate URLs as malicious, producing false positives. Microsoft has acknowledged the issue and has made partial progress toward resolving it, with some previously quarantined messages reappearing in inboxes. Other messages remain quarantined until the fix is complete. Affected users are advised to check the Quarantine page in Microsoft Defender while signed in with their work or school account and release any legitimate messages.
Read at ZDNET
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