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Open message trace In the Microsoft 365 Defender portal at , go to Email & collaboration > Exchange message trace. Or, to go directly to the message trace page, use . At this point, message trace in the EAC opens.

When you run a message trace for older messages, the results are returned within a few hours as a downloadable CSV file. The Exchange message trace link in the Microsoft 365 Defender portal opens message trace in the modern EAC.

Admins can use message trace in the new Exchange admin center to find out what happened to messages. Admins can learn about SMTP errors and non-delivery reports (also known as NDRs or Bounce Messages) that are generated in Exchange Online.

Run a message trace In the EAC, go to Mail flow > message trace. Depending on what you're searching for, you can enter values in the following fields. ... If you're searching for messages that are older than 7 days, configure the following settings: (otherwise you can skip this step): ... Click Search: to run the message trace.

Open message trace In the new EAC at , go to Mail flow > Message trace. Or, to go directly to the Message trace page, use .

How do I search for a specific message ID? If you know the unique Message ID of an email, you can quickly retrieve it by entering the ID in the Email Message ID field of your search. Each email ingested into your archive is assigned a Message ID. NOTE: Message IDs are only assigned to emails.

Resolution Sign in to Microsoft 365 with your Admin account. Click Start a trace. ... In Senders, enter the senders email address to search for all emails from the specified sender. ... In Recipients, enter the recipient's email address to search for all emails from the specified recipient.