How to fix Outlook error 0x8004210b

How to fix Outlook error 0x8004210b

Hey guys, if you are facing the error “0x8004210b outlook 2016” and want to fix it.
So, you are in the right place as in this blog we will discuss what is error ox8004210b, various reasons behind this error, and different methods to fix this error.

Outlook is having some other errors like error 0x800ccc0e, error 0x800ccc0f, error Code 0x800ccc78, error 0x80072F06, and many other. So, you can also know and fix all of these.

So, before talking about its different methods to fix this error.
Let’s talk about “what is error 0x8004210b?”

What is this Outlook error 0x8004210b?

Microsoft Outlook is the most widely used email application and it is used for the purpose of sending and receiving the emails. 

So, whenever the user tries to send and receive the messages than sometimes it may throw an outlook error message.

Task ‘server’ reported an error(0x8004210b):The operation timed out waiting for a response from the sending (SMTP)server. If you continue to receive this message contact your server administrator or internet service provider(isp) ”

This error may appear due to the following reasons:-

1.Improper window shutdown.

2. A problem in window start-up.

3. System freeze while operating.

4. Issue while Window os installation.

Reasons Behind the error ”0x8004210b outlook 2016”

Various reasons/cause behind the Outlook 2016 error are:-

1.Email Blockage

Delete all those messages that are stuck in Outbox as these messages will create the block while sending the email.

2. Virus attack

 virus attack may result in the window or file, it is one of the factors that are responsible for Outlook error 0x8004210b.

3.Incomplete software installation

Incomplete software installation is one of the reasons behind the Outlook error 0x8004210b and can cause great damage to our system.

4. Damaged System files

Damaged system files can be the one reason behind the Outlook error 0x8004210b. 

Manual method to resolve error 0x8004210b

Various manual steps to resolve this error are:-

1. Repair the registry entry related to error 0x800410b.

2. Scan your system and clean it with the help of a cleanup tool.

3. Update your pc device drivers.

4. Now utilize the window system restore that is undoing the recent changes.

5. Next step is to install or uninstall the Microsoft outlook program which is associated with this error message.

6. Run ‘SFC’ command which is basically the window system file checker command.

7. Now, you have to install all the updates related to the window.

If the above given manual method does not work properly then the only way you can resolve this error is to use the Cigati Outlook Email Recovery Software.

It is the best tool that I have ever used to resolve this issue and if you guys want to give it a try. 

So, you can try this software by downloading its demo version and then decide whether to purchase its full version or not and one of the best quality of this tool is that if the user is not satisfied with the software so you can easily ask for the refund of the money and they will return your money without any cross-questioning.

I hope you like both the methods to resolve the error “0x8004210b outlook 2016”.


Ms-Outlook error 0x8004210b is the serious problem that users face every time. I hope the above mentioned different methods (i.e manual and expert methods) are useful in resolving this error and if you guys knew any other method to deal with this issue so you can also share or comment on the method in the comment section given below.


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