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How To Fix Outlook error 0x8004210a?

Sending and receiving emails is the main purpose for which we use Microsoft Outlook. But what if this purpose get interrupted due to annoying error? Outlook error 0x8004210a is such an error which you can encounter when you try to send and receive email in Outlook. Generally the error code appear when user's are unable to connect with the server or if the account settings of Outlook is not configured properly. It is really frustrating when you have to send some important email or waiting for email and suddenly the error appear. If you are also facing this error then this guide will help you to fix it.

Reason Behind Error Code 0x8004210a In Microsoft Outlook


Outlook error 0x8004210a may occur when Microsoft Outlook is unable to establish connection with server. But you can also encounter this error in Outlook due to below listed issues :

  • Incorrect account settings in Microsoft Outlook
  • When Outlook is removed from system or its installation is damaged
  • When an email item on the POP3 server is damaged
  • Due to maximum transmission unit size or anti-virus

In addition damage of user Outlook profile is another common reason behind occurrence of Outlook error 0x8004210a. The main reason behind damage of Outlook user profile is attack of harmful virus or malware on the system. Today there are number of sophisticated malware that easily intrude any computer and start causing issue.

Zedge ToneSync is such a malware which can cause lots of damage to your system and data stored on it. Attack of this virus will put your system on risk because it execute several kind of unsafe activities. The virus is also known for changing system settings and exploiting vulnerabilities that allow other malware invasion like WinZipSmartMonitor.exe. It can also attack files and application stored on compromised system including Outlook which result in PST corruption and other error. If you don't want further chaos then remove Zedge ToneSync.

For more info on virus removal visit : http://deletemalware.trojanremovaltool.org/uninstall-zedge-tonesync-completely

Methods To Resolve Microsoft Outlook Error 0x8004210a


If you are also suffering from Outlook Error 0x8004210a and want to fix it then follow one and more fixes given below. As you complete a step just try to send a email and see if the issue is resolved or not.

Method 1 : Stop all your online application except Outlook. From Outlook menu, select Account Settings. Now double click on email account and select More Settings. In the Advanced window increase the server timeout period.

Method 2 : If you are trying to send or receive large email attachment then it is suggested to wait for email to be sent or received. If there is web access on email account, then connect to mailbox from browser and delete unwanted or less important incoming mails.

Method 3 : Try to disable the antivirus scan for Microsoft Outlook functionality.

Method 4 : Windows Firewall may prevents Outlook from meeting the mail server. So you can disable firewall or just add Outlook to whitelist (Firewall allowed list ).

Note : Using the above mentioned troubleshooting steps you can fix Outlook error 0x8004210a but you can't remove unwanted program which cause such issue. For that you need to use a strong antivirus program.

Solution To Remove Virus And Other Harmful Program From PC


Presence of virus or malicious program in the system will always arise issues. It is also not easy to remove them manually, therefore we are introducing a free-scanner which find out malware on your system and remove them completely. Download it and follow the below steps to scan your system.


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