How To Fix Microsoft Outlook Error Message 0x8004210b ?

Reasons Behind 0x8004210b Outlook Error

The 0x8004210b error on Outlook is the result of several causes:

1. A slow or unreliable internet connection may result in a timeout if Outlook attempts to connect to the SMTP server.
2. When the email server settings (SMTP settings) are incorrect or old, Outlook can’t send emails.
3. Sometimes antivirus software may block or interfere with the connection of Outlook to the server.
4. Sending emails with huge attachments can result in timeouts if they are slow to upload.
5. A corrupted Outlook profile can cause many errors, among which 0x8004210b is one.
6. Incorrectly configured firewalls may block the necessary ports, thus not allowing Outlook to connect to the server.

Methods to Fix 0x8004210b

If Outlook cannot connect to the SMTP server, a variety of troubleshooting and solution methods can be used. Some methods, with steps and limitations, are listed below:

1. Check Network Connection

If Outlook is not able to connect to the SMTP server, then check the network connection first. Outlook needs a proper internet connection to connect to the SMTP server. Check whether your device is well connected to the internet or not. If the network connection is poor, resolving the problems may resolve the connectivity of Outlook with the server.

Steps:

1. Ensure that you are connected to the Internet by opening a website or utilizing some other web-based application.
2. If you’re online via Wi-Fi, check whether the strength of the signal is good. You can also try connecting by plugging an Ethernet cable to check if there is an issue with the wireless connection.

Limitations:

• It won’t resolve server configuration issues, profile corruption, or server-related issues.

2. Fix Outlook Error 0x8004210b by Verifying Exchange Server Settings

Misconfigured settings will not allow Outlook to connect to the Exchange Server. In case the issue is due to misconfigured settings, you can resolve it by ensuring the correct server address, port number, and security settings. If unsure of any setting, refer your IT support personnel for the correct setting.

Steps:

1. First, download, install, and launch the MS Outlook application on your system.
2. Next, log in to the Outlook account.
3. Then visit the File > Account Settings > Account Settings tab.
4. Next, choose the desired email account that you want to change.
5. After that, authenticate the server settings.
6. In the end, verify the SMTP server settings in the Outlook application.

Limitations:

• If you do not know what the proper server settings are, this method may not be useful. You will have to trust and depend on your IT department for the proper configuration.

3. Fix 0x8004210b by Disabling Firewall or Antivirus

Antivirus software may block Outlook from being able to connect to the mail server. Try temporarily disabling your antivirus software to check if it resolves the issue. Firewalls can also block email traffic. Turn off Windows firewalls or third-party firewalls to see if they are the source of the error.

Steps:

1. First, search Control Panel in the search box and press Enter to open it. 
2. After that, select the System and Security option in the Control Panel.
3. Select Windows Defender Firewall in the Windows Defender Firewall.  
4. Now, tap the Turn Windows Defender Firewall on or off option.
5. In the end, press OK to make the changes.

If you have third-party antivirus or firewall software installed, disable it temporarily by following the instructions of the manufacturer.

Limitations: 

• Disabling security software leaves your computer vulnerable to harm. Be careful, and make sure you turn it back on at once.
• It might not fix issues outside of security software.

4. Fix 0x8004210b By Repair Outlook Profile

A corrupted Outlook profile can cause a range of problems, such as connection problems. 

How to repair Outlook:

1. First, search Control Panel in the search box and press Enter to open it. 
2. After that, click on the Programs tab.
3. Next, select the Programs and Features > Microsoft Office.
4. In Microsoft Office, select the Change option.
5. Choose either Quick Repair or Online Repair and follow the on-screen instructions to complete the process. 
6. In the end, restart your computer to apply the changes.

Limitations:

• Repairing a corrupted profile or reinstalling a new one may repair some issues. Nevertheless, it is not a guarantee that all profile-related errors are fixed.
• If you choose to install a fresh Outlook profile, there is a possibility of losing past profile settings, signatures, and profile-specific settings.

Professional Ways to Solve “Sending Reported Error 0x8004210b”

If you cannot connect to the SMTP server, there could be a corrupted Outlook file. To fix this problem, try to use an expert PST Recovery software. This software has various features that make it possible for users to recover Outlook files without data loss. Its user-friendly interface differentiates it from other software, providing an effortless and comfortable experience for all users. The tool’s effective design improves recovery speed without compromising the reliability of the data. Additionally, it resolves the 0x80040900 error along with SMTP-related issues.

Steps to Fix 0x8004210b Error:

1. First, install and run the PST recovery tool on your system.
2. Then, click the Open icon to open the corrupted PST file.
3. Next, browse the PST file from your local drive.
4. After that, choose the recovery mode based on corruption.
5. Now, preview your PST data to ensure the data hierarchy.
6. Then, choose the specific file that creates corruption.
7. Here, select the output file format and the additional built-in feature.
8.  In the end, click on the Save button to save the resultant file.

Conclusion

If you prefer to have a rapid solution to fix 0x8004210b, then you can take the help of a professional utility. However, you also have some manual methods that may suit your needs. If the email is severely damaged, then you should avoid taking all the manual steps and prefer going directly to the professional tool. This software assists you to repair the error easily and offers an immediate solution without any scope of data loss.