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Fix Outlook error 0x8004210a- ”The Operation Timed Out Waiting For a Response”

Are you getting Outlook Error 0x8004210A while sending mails via Outlook? These are some common Outlook errors of which send receive error is one of it’s kind. In this article you will learn how to fix Outlook Error 0x8004210A but before that let us know what this email error 0x8004210a all about.

What does error 0x8004210A mean?

Error 0x8004210A usually appears when you tend to send or receive mails using Outlook as a mail client. This email error 0x8004210A refers to operation time out while waiting for a response from the receiving server when you try to send or tend to receive mails from a recipient.

How do I fix error 0x8004210A?

There are multiple methods mentioned below using which you can easily fix this email error 0x8004210A. 

Method 1 : Verify your  Internet connection

Just verify that your PC has access to active internet connection. There might be a situation where one cannot send or receive mails due to internet outrage and face this error “operation timed out waiting for a response”. You can fix this by resetting your router or refer to fix slow internet for more details.

Method 2 : Delete Suspicious or Spam mails from your Mailbox

There are chances that these suspicious or spam mails might lead to corruption of Outlook. It is recommended to delete those suspicious or spam mails at regular intervals so that your Outlook runs smoothly.

Note: Incase your Outlook gets corrupted you can make use of Remo PST repair tool which can repair severely corrupt or damaged .pst files and ensures safe recovery of your Outlook data items.

Method 3: Increase Timeout Interval of your Account’s server

There might be situations where in the mail you are trying to send from your Outlook mailbox might take longer than usual. However, by default the timeout interval in Outlook is set to less than 1 min which might create discrepancies while sending or receiving mail. Hence, in such cases it is recommended to increase the timeout interval of your account’s server to avoid Outlook error 0x8004210a. Follow the below mentioned steps to increase timeout interval of your Outlook account:

Step 1 : Go to File menu and click on Account Settings button from the dropdown menu.

Step 2 : Now select the account for which you want to increase the time interval and click on Change.

Step 3 : A new window will appear. Click on More Settings.

Step 4 : A dialog box will appear. Click on Advanced Tab and manually increase the time.

Method 4: Check Antivirus Scanner and Ensure that it is Disabled

Even after increasing the timeout interval if you are facing Outlook error 0x8004210a, it might be because of  the antivirus software that is associated with the Outlook. This is because every time the mail is sent or received from your Outlook mailbox, antivirus tends to scan the mail to ensure safety. This might result in delay. Hence, one is recommended to update antivirus software or disable Antivirus temporarily.

Method 5: Try recreating a new profile in Outlook

Even after increasing the timeout interval and disabling or updating the antivirus software Outlook error 0x8004210a occurs there might be a problem with your Outlook profile. This problem usually occurs when your Outlook is damaged or corrupted. Hence try recreating a profile in Outlook which is a solution for most common Outlook errors. Follow the below mentioned steps to recreate Outlook Profile:

Step 1 : Close Outlook and navigate to the Control Panel.

Step2 : Click on Mail option 

Step 3 : A pop-up dialog box will appear. Click on Email accounts.

Step 4 : Now click on Remove option to delete the Outlook mail.

Step 5 : Select Add option to re-add the account.

Method 6: Repair File using SCANPST - “Inbox Repair Tool”

ScanPST also known as Inbox Repair tool can help you to get rid of Outlook error 0x8004210a or send receive errors. There are chances that your Outlook mailbox is corrupted or damaged and ScanPST Repair tool is capable of fixing low level corruptions. One can try repairing their Outlook Inbox using ScanPST Repair tool. Follow the below mentioned steps to repair ScanPST.exe.

Step 1 : Close Outlook application and navigate to one of the below mentioned locations based on the Outlook version you are using:

  • Outlook 2019: C:\Program Files (x86)\Microsoft Office\root\Office16
  • Outlook 2016: C:\Program Files (x86)\Microsoft Office\root\Office16
  • Outlook 2013: C:\Program Files (x86)\Microsoft Office\Office15
  • Outlook 2010: C:\Program Files (x86)\Microsoft Office\Office14
  • Outlook 2007: C:\Program Files (x86)\Microsoft Office\Office12

Step 2 :  Click on SCANPST.exe and then select Browse.
Step 3 : Choose Outlook Data File(.pst) which you want to scan.
Step 4 : Click on Start to initiate the repairing process.
Step 5 : In case of any errors, click on the Repair option to fix it.
Step 6 : Once the process is terminated, open Outlook application to check if it’s working or not. 

If an Outlook data file is severely corrupted or damaged, the ScanPST Repair tool cannot detect and fix such errors as the ScanPST repair tool can only fix low level corruptions. If above mentioned methods do not work then there is a high probability that your Outlook is severely corrupt or damaged. You can leverage Remo PST Repair tool to fix severely corrupted or damaged files with ease. This tool works with all versions of Outlook and comes handy when your Outlook is severely corrupted or damaged. Download the software now!!


In this article we have discussed several methods using which users can resolve Outlook error 0x8004210a with ease. However, a corrupted or damaged Outlook file is a common reason for Outlook error 0x8004210a and one can try fixing it using Remo PST Repair tool. In case of any queries one can get in touch with our technical support team who will be more than happy to guide you. 

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Tony Landry

Tony Landry is a Web Content Editor at Remo Software. He loves to write, edit, and manage content for users trying to troubleshoot and fix problems on Windows, Outlook, storage drives and Cloud storage networks.

He has published more than 200 articles in Remo Software blog. He actively engages in research and problem-solving techniques to consistently generate great web content. Fixing various hardware problems on computer and storage devices along with a great knack for fixing Outlook errors, Tony is also the fun-time IT guy for all his work friends. He lives in the San Francisco Bay Area and enjoys cycling.

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