How to Fix Error 0x8004210B in MS Outlook?

The Outlook error 0x8004210B commonly occurs for users trying to send or receive emails. The reason for this error could be connectivity issue or the Outlook is unable to connect to the server. Such MS Outlook errors not only hamper the work but also put you into the potential risk of data loss. The good news is that you can always troubleshoot such issues by following the tips and tricks that we will discuss in this blog. Before that let us know more about the Outlook Error 0x8004210B in detail.

What is Outlook Error 0x8004210B? Outlook Error 0x8004210B is typically encountered when users face problem to send or receive emails. It’s often accompanied by an error message that reads something like “Sending reported error (0x8004210B): The operation timed out waiting for a response from the sending (SMTP) server.” The message itself indicated that the issue is associated with the server involved in the handling of sending / receiving of data.

How to Fix Outlook error 0x8004010f in Windows?

What Causes is Outlook Error 0x8004210B? Reasons and Remedies

Several factors can contribute to the error during sending and receiving of emails. Here are some of the most common ones:

Connectivity Issues: Poor internet connection or intermittent network disruptions can prevent Outlook from communicating with the email server, leading to a timeout error.

Firewall or Antivirus Interference: Overly restrictive firewall settings or aggressive antivirus software may block Outlook’s access to the email server, resulting in the error.

Incorrect Email Settings: Misconfigured email account settings, such as incorrect server addresses, port numbers, or authentication settings, can cause Outlook to fail in sending or receiving emails.

Server Problems: Temporary issues with the email server, such as maintenance or downtime, can prevent Outlook from establishing a connection, leading to the error.

Large Attachments: Attempting to send emails with large attachments may exceed server limits or bandwidth capacity, triggering a timeout error.

How to Fix MS Outlook Error 0x8004210B?

Now that we understand the potential causes of this error, let’s explore some troubleshooting steps to resolve it. But before that it always advisable to create backup of outlook data to prevent permanent data loss.

Check Internet Connectivity: Ensure that your internet connection is stable and that there are no ongoing network issues. Try accessing other websites or online services to confirm connectivity.

Repair Outlook Data Files: Use the built-in repair tools in Outlook to scan and repair any corrupted or damaged data files (PST or OST). This can help resolve underlying issues that may be causing the error. However, if the scan repair tool fails to fix the problem, simply convert Outlook data file to any versatile file format to protect

Disable Firewall or Antivirus Temporarily: Temporarily disable your firewall or antivirus software and attempt to send/receive emails again. If the error no longer occurs, adjust the settings of your security software to allow Outlook access to the internet.

Verify Email Account Settings: Double-check your email account settings in Outlook to ensure they are configured correctly. Pay attention to server names, port numbers, encryption methods, and authentication settings. You may need to consult your email provider’s documentation for the correct settings.

Test Email Server Status: Verify if the email server is experiencing any downtime or maintenance by visiting your email provider’s website or contacting their support team. If the server is down, you’ll need to wait until it’s back online.

Limit Attachment Sizes: If you’re encountering the error while sending emails with large attachments, consider reducing the size of the attachments or using a file-sharing service for larger files.

Update Outlook: Ensure that you are using the latest version of Outlook. Microsoft regularly releases updates and patches to address bugs and improve performance. Updating Outlook to the latest version may resolve the error.

Conclusion: MS Outlook Error 0x8004210B can be frustrating, but it’s usually manageable with the right troubleshooting steps. By following the solutions outlined in this guide, you should be able to identify and resolve the underlying issues causing the error, restoring your ability to send and receive emails seamlessly.

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