How to Resolve Outlook Sending Error 0x80040201

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If you are an Outlook user, you may have probably encountered Outlook error 0x80040201. In this blog, we will describe what the error message means and how to fix it. We also provide you with the most obvious reasons for this Outlook issue. So, read the article carefully.


MS Outlook is one of the most remarkable and oldest desktop-based email clients. Its unmatched service, frequent updates, and continuous support are the traits for its recognition among businesses and individuals. Despite its effectiveness, sometimes users encounter Outlook error messages. One such error message is Outlook sending error 0x80040201.

What is Outlook error message (0x80040201)?

This error occurs when a computer, once a part of the MS Exchange server, attempts and fails to make a connection with another similar computer earlier belonging to the same exchange server.

Now, there can be many possible reasons for this error code to appear. Let us discuss them in detail.

Why Outlook Error 0x80040201 Arise?

When an Outlook error appears, it resembles that there is some fault in Outlook configuration settings. Sometimes, the problem is due to some other application. So, below we mention some possible reasons for the Outlook error 0x80040201 while sending mails.

  • Faulty Add-ins: Outlook Add-ins sometimes create obstacles with the functioning of Outlook. They lead to various error messages. Outlook error message 0x80040201 may also occur due to this faulty add-in.
  • Third-party Antiviruses: When an Antivirus asks for permission, they sometimes try to modify the root file of Outlook and attempt to change some settings. Hence, Outlook errors tend to appear.
  • Outlook Cached Contact file (NK2 file): NK2 file stores the nickname of the user belonging to the Outlook profile. It often creates issues with the existing Outlook profile and causes error 0x80040201.
  • Outlook data file corruption: A corrupt Outlook data file leads to various Outlook errors. One such error message is Error Outlook 0x80040201 error.

These are some of the most prominent causes of the problem. Now, it is time to learn how to resolve the issue.

Also Read: How to Fix Outlook Error 0x80040115 – Recommended by Professionals

How to Resolve Outlook Sending Error 0x80040201

You can resolve the Outlook error message in various ways depending upon the reason for the issue. Outlook provides different inbuilt options to fix any error message. If the problem arises because of some other application, you need to change their settings. The following are the most effective solutions for the Outlook error code 0x80040201.

Solution 1: Disable Outlook Add-Ins

  • Open the Run Type Outlook/ safe in the field and press OK.

outlook safe mode

  • It will open Outlook in safe mode. Click on the File button in the menu bar.

Outlook in safe mode

  • Now, select the Options tab from the left pane.
  • After that, choose the Add-In tab in the Options wizard.

choose the Add-In tab

  • Scroll down and click on the Go button in front of the Manage option.


  • Now, disable all add-ins and click on the OK button.
  • After that, restart Outlook again and enable all add-ins one by one.
  • It will help you to identify the faulty add-in. Keep it disabled to fix the error 0x80040201 for Outlook.

Solution 2: Create a New Outlook Profile

Another option to resolve the Unknown Error 0x80040201 is to add a new Outlook profile. Follow the steps below to create a new account.

  • Launch the MS Outlook application and click on the File button.
  • After that, click on the Account Settings icon and select the Manage Profile option.

●	Launch the MS Outlook application

  • Click on the Show Profiles
  • In the new wizard, press the Add button to add the new Outlook profile.

click on the Account Settings icon

  • Enter the name of your new Outlook profile and press OK to proceed further.
  • Now, you will see the Add Account Fill in all the required details of the email account.
  • After that, click on the Finish button to complete the setup.
  • Now, you will return to the Mail wizard. Tick the Always use this profile option and choose the new user account from the drop-down.
  • At last, click on the OK button to add the new Outlook profile.
  • Restart Outlook, and it will resolve the Outlook sending error 0x80040201.

Solution 3: Empty the Auto-Complete List

  • Open MS Outlook in your system and select the File button in the menu bar.
  • Now, click on the Options tab on the left.
  • In the Options wizard, choose the Mail
  • Click on the Empty Auto-Complete List option in the Send Messages
  • After that, a pop-up will appear. Press the Yes button to confirm.
  • It will empty the Auto-complete list of Outlook and further fix the error 0x80040201.

Solution 4: Delete Cached Outlook Contacts (NK2 File)

  • Open the Run command and type the following to locate the NK2 file.
  • %APPDATA%\Microsoft\Outlook
  • After that, search for the NK2 file.
  • Select the file and delete it. By deleting the Cached Outlook Contacts, you will be able to resolve the Outlook 0x80040201 error.

Solution 5: Turn Off Windows Security

The built-in Windows defender also sometimes hinders the Outlook application. It will cause the Sending reported error (0x80040201). So, you need to disable Windows Security to fix the issue. Follow the steps below to disable the defender.

  • Open the search bar and type Windows Security.
  • Select the Windows Security app and launch it.
  • After that, go to the Virus & Threat Protection
  • Click on the Manage Settings option in the Virus & Threat protection settings.
  • Turn off the Real-time protection It will disable Windows Security.

Note: If you have installed some other Antivirus applications, disable them first. It is possible that the problem occurs due to that third-party antivirus software and not because of Windows Security.

Solution 6: Professional Tool to Repair Damaged PST File

If the Outlook error appears because of a corrupted PST file, you need to repair the file. You can opt for the inbuilt scanpst.exe, but it is not much effective for severely damaged files. So, we suggest the DRS PST Recovery Tool. It can restore highly corrupted files easily. Also, it has all the advanced features to repair the maximum possible data from the file.


Till now, we have explained what Outlook error 0x80040201 is. What are the reasons for the error message? And how to resolve the error code? There are different inbuilt options in Outlook. In case of Outlook data file corruption, the best solution is the professional PST Recovery tool. It will efficiently repair your corrupted Outlook file and resolve the Outlook sending error 0x80040201

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