Outlook Error 0x8004210a
The error 0x8004210a in MS Outlook is common to versions 2019, 2016, 2013, 2010, and 2007. Most commonly, this error is witnessed when users try to send or receive emails after some internal changes have been made to Outlook settings or protocols. These changes could be made automatically after certain operating system upgrades or manually by inadvertent users who didn’t know what they were getting into. Particularly concerning wrong timeout settings of the server, the real cause behind error 0x8004210a in MS-Outlook is the incorrect handling of account settings primarily SSL layer authentication, port number, and other relevant settings.
To give a little description of Outlook timeout settings and why they are critical, Outlook uses a stipulated time to complete the email send-receive operation. Whenever a complete email (along with attachments) cannot be sent or received within the set time interval, error 0x8004210a is thrown. Now there could be more than one reasons leading to the expiry of this stipulated time interval before the send-receive operation can be completed including incorrectly assigned emailing protocols, hindrance from the antivirus program, garbled firewall settings, etc. Thus, if faced with such an error, rectifying the Outlook profile settings should be the place to start.
How to fix error 0x8004210a in MS Outlook Manually?
Try the following manual fixes to resolve the 0x8004210a error. Proceed to the next fix only if the previous one fails. After complete the steps mentioned in each fix, send yourself a test mail to check if it worked.
- Configure your Antivirus program and Windows firewall and enable unrestricted access to Outlook (outlook.exe)
- Delete suspicious emails from your mailbox as they may block your receiving error message in Outlook. Also, clean up pending messages stuck in the Outbox
- Launch Outlook in safe mode by typing outlook.exe /safe in the Windows Run dialog to see if send-receive works. If it does the culprit might be a faulty Outlook add-in
- Increase server timeout duration as follows:
- From the Outlook ‘File’ menu option open Account Settings
- Select the affected email account and click on ‘Change’
- Click on ‘More Settings’
- In the ‘Internet Email Settings’ pop-up window, switch to the ‘Advanced’ tab and increase the server timeout time according to the requirement
- Click on ‘OK’
- Repair your Outlook installation by going to Control Panel, selecting MS Office and clicking on ‘Repair’
- Create a new Outlook profile and try to send-receive email using it. Follow the below-mentioned steps:
- From Control Panel -> Mail -> Show Profiles select your current Outlook profile and view its ‘Properties’ to know its exact location
- Then again go to Control Panel -> Mail -> Show Profiles and click on ‘Add’ to create a new Outlook profile
- Give it proper details and click on ‘Finish’ to complete setup for the new profile
- Thereafter from Control Panel -> Mail -> Show Profiles select the profile you just created and select the ‘Always use this profile’ setting to set this profile as the default