Microsoft Exchange Online Email Quarantine Crisis: What You Need to Know

You hit send. The email leaves your outbox. You wait for a reply.

And nothing happens.

Not because your message was ignored. Not because it bounced. But because the email system itself silently decided your legitimate business message was phishing — and locked it away in quarantine.

In this episode of TechDaily.ai, David and Sophia unpack a major Microsoft Exchange Online incident that began on February 5, 2026, where legitimate emails were mistakenly flagged as “high confidence phish.” The result? Real business communications vanished into server-level quarantine without senders or recipients knowing.

This wasn’t...