Send & Receive Issues

Fix Outlook Emails Stuck in Outbox Until Computer Restarts

Ayan Masood Sep 29, 2026 869 views

Question details

Outgoing emails remain trapped in the Outlook Outbox and are only successfully sent after the user restarts their computer.

How to Fix Outlook Emails Stuck in Outbox Until Restart

Product: Microsoft Outlook
Device & OS: not provided
Scenario: Attempting to send emails through the Outlook desktop application for regular correspondence.
Observed behavior: Messages sit indefinitely in the Outbox folder instead of sending immediately, requiring a full system reboot to trigger the outgoing mail server synchronization.

Before you start

Verify that your internet connection is stable and ensure Outlook is not accidentally set to 'Work Offline' by checking the status bar at the bottom right corner of the application window.

Solution 1Recommended

Enable Send Immediately When Connected

Adjusting Outlook's advanced settings ensures that messages are pushed to the server as soon as you click send, bypassing delayed synchronization cycles.

Often, Outlook is configured to only send emails during scheduled Send/Receive intervals. If the synchronization interval is disrupted, emails will sit in the Outbox. Forcing the application to send immediately upon clicking the send button resolves the most common cause of this delay.

Access Outlook Options

Open the Outlook desktop app. Click on 'File' in the top-left corner of the ribbon, then select 'Options' at the bottom of the left-hand menu.

Navigate to Advanced Settings

In the Outlook Options dialog box, click on 'Advanced' in the left pane.

Enable Immediate Sending

Scroll down to the 'Send and receive' section. Check the box next to 'Send immediately when connected'. Click 'OK' to save your changes and restart Outlook.

Verification Tip: After enabling this setting, create a quick test email and send it to yourself to verify if it leaves the Outbox without requiring a system restart.

Solution 2

Repair Your Email Account Settings

Use the built-in account repair tool to fix corrupted connection protocols between Outlook and your mail server.

Solution 3

Perform an Office Quick or Online Repair

Fix deep-seated software glitches by running Microsoft's automated installation repair tool from your system settings.

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Frequently Asked Questions

Why do my emails get stuck in the Outbox even when my internet is working?

This can happen if Outlook is inadvertently toggled to 'Work Offline' mode, if the email contains a massive attachment that exceeds server limits, or if a third-party antivirus program is scanning and blocking outgoing mail.

Can a corrupted add-in prevent Outlook from sending emails?

Yes. Third-party add-ins, especially those related to security or CRM integrations, can interfere with the send/receive process. You can test this by launching Outlook in Safe Mode (hold the CTRL key while opening Outlook) and trying to send an email.

How can I manually force Outlook to send messages stuck in my Outbox?

You can attempt a manual sync by navigating to the 'Send / Receive' tab on the top ribbon and clicking 'Send/Receive All Folders', or by simply pressing the F9 key on your keyboard.

Outlook & Email Problems