Microsoft: Anti-phishing rules mistakenly blocked emails, Teams messages

Microsoft says an Exchange Online issue that mistakenly quarantined legitimate emails last week was triggered by faulty heuristic detection rules designed to block credential phishing campaigns. [...]

https://www.bleepingcomputer.com/news/microsoft/microsoft-anti-phishing-rules-mistakenly-blocked-emails-teams-messages/

Posted from: this blog via Microsoft Power Automate.