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Microsoft: Exchange Online sending your legitimate emails as phishing, spam? – March 2026

Author/Source: False positives: When a security system incorrectly identifies something safe as a threat. See the full link here

Takeaway

The article discusses a problem with Microsoft’s Exchange Online service where real emails are being mistakenly marked as phishing or spam. This is happening because of a faulty update to the system’s filtering rules.


Technical Subject Understandability

Beginner


Analogy/Comparison

It’s like a security guard who suddenly starts turning away people with valid IDs because of a mistake in the instructions.


Why It Matters

Important emails, like those from your bank or doctor, could end up in your spam folder or be blocked completely. This can cause you to miss critical information or deadlines. For example, a customer might not receive an order confirmation.


Related Terms

False positives

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