How to use message trace in Exchange Online

Message trace in the Microsoft 365 Defender portal follows email messages as they travel through your Exchange Online organization. You can determine if a message was received, rejected, deferred, or delivered by the service. It also shows what actions were taken on the message before it reached its final status. You can use the information from message trace to efficiently answer user questions about what happened to messages, troubleshoot mail flow issues, and validate policy changes.

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