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Understanding Receive, Pending, and Deliver Status in Microsoft 365 Message Trace
Question details
Users are seeing incoming emails marked as Receive, Pending, or Deliver in Microsoft 365 Message Trace, but the messages are missing from the Inbox, Junk Email, or quarantine folders.
- Product
- Microsoft 365
- Device & OS
- not provided
- Scenario
- Tracking missing incoming emails using the Exchange admin center Message Trace tool.
- Observed behavior
- Messages show as Pending, Receive, or Deliver in the trace results but do not appear in any user folder, sometimes remaining pending for weeks without generating a delivery failure notification (NDR).
Ensure you have the necessary administrator permissions in the Microsoft 365 Exchange admin center to run and analyze an extended Message Trace.
Analyze Message Trace Details and Recipient Mailbox Rules
Review the detailed event logs of the message trace to identify if mailbox rules, spam filters, or security policies intercepted the email.
The status shown in Message Trace merely reflects the processing state. A 'Deliver' status means the message reached the mailbox, but it could have been moved by an inbox rule or third-party filter immediately upon arrival.
Log in to the Exchange admin center, navigate to 'Mail flow', and select 'Message trace'.
Enter the specific sender and recipient details, select a time range, and click 'Search' to generate the report.
Click on the specific message from the results to open the trace details. Look at the 'Message events' section to see exactly which rule or policy processed the email.
If the status is 'Delivered' but missing, ask the recipient to check their Outlook Inbox rules, Deleted Items, and Junk Email folder to ensure a local setting did not hide the email.
Escalate Extended Pending Messages to Microsoft Support
If messages remain stuck in 'Pending' for several days without generating a Non-Delivery Report (NDR), the issue must be investigated at the server level.
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Frequently Asked Questions
Why does an email show as Delivered in Message Trace but is not in my Inbox?
The 'Delivered' status means the message successfully reached the recipient's mailbox. However, inbox rules, Outlook junk filters, retention policies, or delegate access settings may have immediately moved or deleted the message upon arrival.
How long can an email stay in Pending status in Microsoft 365?
Emails can remain in a 'Pending' state while the server attempts retries due to temporary network issues, greylisting, or large attachment processing. If it persists for over 48 hours without generating a Non-Delivery Report (NDR), it usually requires administrative investigation.
Why didn't the sender get a delivery failure notification (NDR)?
If a message is stuck in a pending queue on the backend and the connection hasn't formally failed or timed out according to the server's retry limits, the system may delay or fail to generate a Non-Delivery Report.
Can I use Message Trace to force an email to be delivered?
No, Message Trace is purely a diagnostic and tracking tool used to map the path of an email. It cannot be used to force delivery, alter mail flow, or release quarantined emails.
