Cannot delete email in Outbox

Steinzor, Rena 0 Reputation points
2026-11-13T01:20:55.0366667+00:00

I have an email in my Outbox and I cannot delete it. The system says that Outlook is sending it to the addressee. As a result, the Inbox will not update on the desktop or my Apple phone.

Outlook | Windows | Classic Outlook for Windows | For business
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  1. Teddie Dang 2,160 Reputation points Independent Advisor
    2026-11-13T01:29:55.57+00:00

    Hi @Steinzor, Rena

    This issue may be related to the ongoing Microsoft 365 service incident (MO1550821), which is affecting multiple services, including Exchange Online.

    Since Outlook relies on Exchange Online for email delivery and synchronization, the current service disruption may explain why your message remains stuck in the Outbox, why you cannot delete it, and why your Inbox is not updating on either your desktop or Apple phone.

    According to Microsoft's latest update, the incident remains classified as Service Degradation, and Microsoft is actively working to restore the affected infrastructure. However, no estimated time for full service restoration has been provided yet.

    You can check the Microsoft 365 Service Status for the latest updates.

    I recommend waiting until Microsoft restores the affected services before attempting further troubleshooting, as the issue may resolve once Exchange Online is fully operational again.

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  2. AI answer

    2026-11-13T01:21:34.6466667+00:00

    Put Classic Outlook into Work Offline mode before deleting the message; this stops Outlook from actively transmitting and locking it.

    Remove the stuck message

    1. In Classic Outlook, select Send/Receive → Work Offline.
    2. Check the status bar and wait until it shows Working Offline.
    3. Open Outbox, select the stuck message, and press Delete.
      • To preserve it, drag it to Drafts instead.
      • If it contains a large attachment, open the draft and remove the attachment before attempting to send it again.
    4. If Outlook still says it is transmitting the message:
      • Close Outlook and wait a few moments.
      • If it will not close, press Ctrl+Alt+Delete → Task Manager.
      • Select Microsoft Outlook or outlook.exe, then choose End task.
      • Reopen Outlook while still offline, return to Outbox, and delete or move the message.
    5. Select Send/Receive → Work Offline again to reconnect. The status bar should no longer show Working Offline.
    6. Select Send/Receive All Folders or press F9, then confirm that new mail appears on the desktop and iPhone.

    These are Microsoft’s documented steps for releasing a message that Outlook reports as currently being transmitted.^1^

    If sending or receiving remains blocked

    After the message has been removed:

    • Send a small test message without an attachment.
    • If Outlook remains disconnected or the test message stays queued, start it in Safe Mode:
      1. Close Outlook.
      2. Press Windows+R.
      3. Enter outlook.exe /safe and press Enter.
      4. Test sending again.
    • If sending works in Safe Mode, an add-in is likely interfering. Review File → Options → Add-ins → Manage: COM Add-ins → Go, and disable add-ins for testing one at a time.
    • If Safe Mode does not help, use Microsoft’s Classic Outlook troubleshooters. If those do not resolve the issue, the documented next step is Microsoft support.^2^

    Do not remove the email account merely to clear one Outbox message; removing an account also removes its locally cached content from Outlook.

    References

    1. Outlook email stuck | Microsoft Support
    2. Issues sending and receiving email | Microsoft Support
    AI-generated content may be incorrect. Read our transparency notes for more information.

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