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.

Microsoft has confirmed that a faulty anti-phishing detection rule designed to stop credential theft campaigns mistakenly ...

Microsoft is investigating an ongoing Exchange Online issue that mistakenly flags legitimate emails as phishing and quarantines them.

Microsoft is investigating an Exchange Online incident that wrongly flags emails as phishing, quarantining messages and disrupting delivery.

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Since 5 February, Microsoft Exchange Online has been silently swallowing legitimate business emails. Most people affected ...

Microsoft has confirmed Exchange Online is incorrectly flagging legitimate emails as phishing due to an overly aggressive URL ...