Launch the URL, and select Mail flow You can open message trace in any of the following ways: The Get-HistoricalSearch cmdlet in Exchange Online PowerShell or standalone EOP PowerShell returns all messages in the results. The maximum number of messages that are displayed in the results depends on the report type you selected (For more information, see the Choose report type section.).

To run a message trace, you need to be a member of one of the following role groups:įor more information, see Manage role groups in Exchange Online and Permissions in Exchange Online. What do you need to know before you begin? You can use the information from message trace to efficiently answer user questions about what happened to messages, to troubleshoot mail flow issues, and to validate policy changes. Message trace in the modern EAC improves upon the original message trace that was available in the classic EAC. Message trace also shows what actions were taken on the message before it reached its final status. You can determine if a message was received, rejected, deferred, or delivered by the service. Message trace in the modern Exchange admin center (EAC) follows email messages as they travel through your Exchange Online organization.

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