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FIX: Outlook error 0x8004210B on Windows 10/11
5 min. read
Updated onOctober 4, 2023
updated onOctober 4, 2023
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Key notes
Outlook error 0x8004210B can arise when users try to send emails with that application. It typically arises for users utilizing Outlook as a client application for webmail, such as Gmail.
Many users choose Outlook for its ease of use and also the fact that it enables access to multiple email accounts from one central UI.
The good news is that the issue is minor and there are several easy tricks you can try to fix it.
The error message states:
Sending reported error (0x8004210B): The operation timed out waiting for a response from the sending (SMTP) server.
As a result, Outlook doesn’t send emails, so let’s see how you can fix that.
How do I fix Outlook error 0x8004210B?
1. Set up a new Outlook account
Error 0x8004210B can be due to a corrupted Outlook account. Apply the above steps in that regard.
2. Repair a corrupted Outlook profile
Alternatively, you could try repairing a corrupted Outlook profile. You can do that from the Accounts Settings window. We covered more in the quick guide that provides further details forfixing corrupted Outlook accounts.
3. Check Outlook’s email settings
4. Delete stuck emails
In more recent Outlook versions, error 0x8004210B can arise due to stuck emails with unsupported attachments. Apply the above steps to correct that easily.
5. Uninstall antivirus software
McAfee, Kaspersky, and other antivirus software might be blocking Outlook from the email server. Uninstalling the software as outlined above might leave some residual files behind.
You can uninstall some antivirus software with more specific and thorough uninstaller utilities provided by their publishers. So, check if there’s a specific uninstall utility for your antivirus package.
6. Use a different email client
You clearly experience severe problems with your actualemail client, so take into consideration the option to try out a different email client.
With countless free color themes to match precisely your style and a minimalist, lightweight design, rest assured that you can’t go wrong when choosing Mailbird.
In fact, it isn’t about simply avoiding the error 0x8004210B. Mailbird also integrates perfectly with other applications that you use daily – Dropbox, Twitter, Evernote,Facebook– you name them.
⇒Get Mailbird
If the above resolutions don’t resolve error 0x8004210B for you, you might need to contact your ISP for further support.
TheMicrosoft Support and Recovery Assistantfor Outlook might also provide a fix for the issue. ClickDownloadon theMicrosoft Support and Recovery Assistantpage to try that utility out.
Need a better email client? If so, just check out theseemail clients that support multiple accounts.
If you’re not ready for such a change, we also have aTroubleshooting Outlook Hubwaiting for you.
Let us know which of our methods helped you with your Outlook issue. Do so by leaving us a message in the comments section below.
Matthew Adams
Windows Hardware Expert
Matthew is a freelancer who has produced a variety of articles on various topics related to technology. His main focus is the Windows OS and all the things surrounding it.
He is passionate about the tech world, always staying up-to-date with the latest and greatest. With an analytical view, he likes problem-solving, focusing on errors and their causes.
In his free time, he likes to read and write about history and tries to always develop new skills.
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Matthew Adams
Windows Hardware Expert
He is passionate about everything surrounding Microsoft’s OS, focusing on troubleshooting guides & tips for everyday problems.
