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How to Fix Outlook Repeatedly Downloading Emails and Not Sending
Question details
The user needs to stop Outlook from continually downloading older emails and restore the ability to send outgoing messages.
- Product
- Microsoft Outlook
- Device & OS
- Windows
- Scenario
- Managing and syncing emails via a POP account in Microsoft Outlook.
- Observed behavior
- Outlook repeatedly downloads previously received emails and gets stuck when attempting to send new messages, often triggered by a recent Windows update or corrupted profile.
Verify that your internet connection is stable and log into your webmail account via a browser to ensure your email provider's servers are functioning correctly.
Check and Uninstall Problematic Windows Updates
Specific Windows updates (like KB5074109) have known bugs that cause POP accounts in Outlook to repeatedly download older messages and fail to send.
If this issue started immediately after a system update, rolling back the most recent Windows update can often resolve the POP3 synchronization bug while Microsoft prepares a permanent patch.
Click the Start menu, go to Settings, select Windows Update, and click on 'Update history'.
Scroll down to 'Uninstall updates' and look for KB5074109 or any other update installed right before the issue began.
Click 'Uninstall' next to the update, follow the on-screen prompts to remove it, and then restart your computer.
Run Outlook in Safe Mode and Disable Add-ins
Faulty or outdated third-party add-ins can interfere with Outlook's Send/Receive operations.
Create a New Outlook Profile
A corrupted local Outlook profile can break email synchronization and result in duplicated downloads.
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Frequently Asked Questions
Why does Outlook keep downloading the same emails over and over?
This usually happens when the connection to the server is interrupted, the local data file (.pst) becomes corrupted, or there is a bug in a recent software update affecting how POP3 accounts track downloaded messages.
How do I stop Outlook from duplicating my inbox messages?
You can try logging into your webmail to move older messages out of your inbox into a separate folder, recreate your Outlook profile, or adjust your Send/Receive settings to prevent sync conflicts.
Can a full mailbox prevent Outlook from sending new emails?
Yes. If your email server storage quota is reached, your provider may block outgoing messages. Check your storage limits via your webmail portal and delete large, unnecessary files if needed.
What is the difference between POP and IMAP regarding this downloading issue?
POP downloads emails to the local device and tracks them locally, which can cause duplicate downloads if the local tracking file breaks. IMAP synchronizes directly with the server, mirroring the mailbox, and typically avoids this specific repetitive download issue.
