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Resolve the Outlook Error, '0x8004210a' While Sending or Receiving an Email Message

Outlook is widely used by people at home and offices across the globe as it offers an array of useful features. However, Outlook users often encounter errors while accessing Outlook files. One such error is, '0x8004210a' While Sending or Receiving an Email Message'. Don't worry if you encounter this error as we have mentioned the helpful methods that can help you resolve the error and what triggers the error code. It is advisable that you opt for a safe approach that can retrieve the entire data without causing loss of data. Selecting the wrong method can erase your entire files permanently so be extra cautious while selecting the method to resolve the error.

Reasons behind the Error Code, '0x8004210a'

There are several reasons behind the error, '0x8004210a'; however, we have listed some of the factors that trigger the error code:

  • When the users make any internal modifications in the Outlook settings.
  • An incorrect timeout setting of the server.
  • Exceeding PST file size.
  • Wrong handling of your account settings.
  • Corruption and damage of PST files.
  • Blockage from Antivirus software.
  • Incorrect setting of SSL authentication.

Resolve the Outlook Error, '0x8004210a' While Sending or Receiving an Email Message by Using the Manual Method

The user can fix the error, '0x8004210a' by using the manual method, however, let us warn you about this approach as it is quite risky to execute all the steps correctly and even a single wrong step can cause loss of data. If you are not from a technical background, then you might find it intimidating so make sure that you execute the steps only if you think you will be able to do correctly. Below, we have listed the steps to resolve the error by using the manual method:

  • Set up your antivirus software firewall settings and enable access to Outlook.
  • Now, delete the suspicious emails and clean up the messages in the Outbox.
  • Then, start Outlook in the 'Safe Mode' and type, 'Outlook.exe/safe' in the 'Run Dialog' box.
  • Increase the server timeout duration.
  • Go to the 'Control Panel' option.
  • Click on the 'Repair' tab.
  • Now, make a new Outlook profile.
  • Click on 'OK'.

The above-mentioned are the steps that will enable the user to resolve the Outlook error code by using the manual approach. Just make sure that you don't make any mistake and perform all the steps correctly. This way, you will not lose your files or corrupt your data. If a user is unable to resolve the error even after trying the manual method, then it is highly suggested that you opt an automated tool.

Fix the Outlook Error, '0x8004210a' While Sending or Receiving an Email Message by Using an Automated Tool

If a user is encountering the Outlook error code, '0x8004210a', then we suggest you pick KDETools PST Recovery Tool to fix the error. The software is well-equipped with advanced features that enable the users to resolve the error with risking the security of their files. The user can get a free preview of the files and cross-check before the repairing process starts. The user can repair any file size and any type of file such as damaged, orphaned, password-protected, and etc. The tool supports all the versions of Outlook and Windows.

Highlighting Features of KDETools PST Recovery Tool

  • The tool supports both ANSI and UNICODE file types.
  • The software can repair any type of PST file irrespective of the damage.
  • The tool migrates the repaired PST files in multiple formats such as EML, PDF, HTML, EMLX, and etc.
  • It preserves the Metadata of an email and folder structure.
  • The Recovery tool exports the repaired files directly to Office 365 and Exchange Server account.


If a user is encountering Outlook error, '0x8004210a' While Sending or Receiving an Email Message', then don't worry as we have discussed the manual approach and how a user can resolve the error by using an automated tool in this blog. Just make sure that you weigh the pros and cons of both the methods to resolve the error and then select accordingly. Whatever the method you select should be able to retrieve your data without losing your files.

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