Message Trace FAQ in Exchange Online | Microsoft Docs
docs.microsoft.com › message-trace-faqOct 13, 2021 · After that, the message is not traceable under the original recipient. You can trace the message again using the new recipient. MAIL FROM: The message trace tool uses the MAIL FROM value presented at the initiation of the SMTP conversation as the Sender in a search, regardless of what the DATA section of the message shows. The message may show ...