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Fix Microsoft 365 Outlook Emails Not Delivered to Internal Recipients
Question details
Microsoft 365 Exchange Online users can send emails to external contacts, but messages sent to internal recipients are not received in their Inbox or Junk folders.
- Product
- Microsoft 365 Outlook
- Device & OS
- not provided
- Scenario
- Sending internal emails to colleagues within the same Exchange Online organization.
- Observed behavior
- Internal emails disappear completely without arriving in the recipient's Inbox or Junk Email folders, whereas external emails are sent and received normally.
Verify that the affected users have enough mailbox storage space and that they are not experiencing broader network or syncing issues by checking Outlook on the Web (OWA).
Run a Message Trace in the Exchange Admin Center
This is the most effective administrative method to pinpoint exactly where the internal email failed or if it was redirected by a server rule.
A message trace follows email messages as they travel through your Exchange Online organization. You must have Exchange administrator privileges to perform this action.
Sign in to the Microsoft 365 admin center using your administrator credentials, then navigate to the Exchange admin center.
In the left navigation pane, go to Mail flow and click on Message trace.
Enter the specific sender and internal recipient email addresses. Set the time range to cover when the missing emails were sent.
Click Search to run the trace. Review the delivery status to see if the email was Delivered, Filtered as Spam, Failed, or redirected by a transport rule.
Check Inbox Rules and Forwarding Settings
Ensure that local client settings aren't silently moving or deleting internal messages as soon as they arrive.
Verify Non-Delivery Reports (NDR) and DNS Records
Check domain-level configurations and bounce-back messages for specific error codes related to internal routing.
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Frequently Asked Questions
Why am I not getting bounce-back messages (NDRs) for failed internal emails?
The emails might be getting trapped in a Microsoft 365 quarantine filter or silently dropped by an Exchange transport rule before an NDR can be generated.
Can a corrupted Outlook profile cause internal emails to disappear?
Yes. If the profile is corrupted, Outlook might not sync the server folders correctly. Try accessing Outlook on the Web (OWA) to see if the missing emails appear there.
What if the message trace shows the email was 'Delivered' but the user still can't see it?
This usually indicates the email was moved by a client-side inbox rule, redirected to a hidden folder, or the user's desktop Outlook client is failing to synchronize properly with the Exchange server.
