How To Fix Outlook Error Code 0x80042109 in Windows 11/10

Many Outlook users have reported seeing an issue while sending and receiving emails. The complete error message is as follows –


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Task ‘SMTP’ server – Sending’ reported error (0x80042109) :”Outlook is unable to connect to your outgoing(SMTP) e-mail server.If you continue to receive this message, contact your server administrator or Internet Service Provider(ISP).”

Mostly this error is seen when you are using MS Outlook (the desktop app) and even Outlook Web or Outlook on your phone. In this article, let us check out different ways of fixing this error. Before trying out the below fixes, ensure your network is up and stable.

Fix 1: Change the Outgoing Port

Many ISPs require you to use their SMTP servers if you use port 25. Hence, changing it to other default ports solves the issue at times.

Step 1: Open the MS Outlook Application.

Step 2: Click on File from the top menu options.

 

File From Menu

 

Step 3: In the appearing window, under the Info tab, click on the Account Settings

Step 4: Click on the Account Settings from the Pop-Up Context Menu.

 

 

Acc Info

 

 

Step 5: In the Account Settings window that opens, click on the required account and then press Change as shown below.

 

Required Account Change

 

Step 6: In the Change Account window, click on the More Settings button.

Step 7: In the Internet Email Settings window that opens, click on the Outgoing Server tab.

Step 8: Check the box corresponding to My outgoing server (SMTP) requires authentication.


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Step 9: Now, tick on Use same settings as my incoming mail server.

Step 10: Now, click on the tab named Connection.

Step 11: Tick on Connect using my local area network(LAN)

Step 12: Click on the Advanced tab.

Step 13: Set the Incoming server(POP3) to 110.

Step 14: Set the Outgoing server(SMTP) to 587.

Step 15: From the Use the following type of encrypted connection drop-down, choose TLS.

Step 16: Finally, Click on OK.

Step 17: Close and re-open the Outlook Application.

Step 18: Press on Send/receive button.

Step 19: If you see the error again, open the Internet Email Settings window(Steps 1 to 7) and click on the Advanced tab.

Step 20: Set the Outgoing server(SMTP) to 465.

Step 21: From the Use the following type of encrypted connection drop-down, choose SSL.

Fix 2: Remove and Re-add the Outlook Account

Step 1: Open the MS Outlook Application.

Step 2: Click on File from the top menu options.

 


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File From Menu

 

Step 3: In the appearing window, under the Info tab, click on Account Settings.

Step 4: Click on Account Settings from the Pop-Up Context Menu.

 

 

Acc Info

 

 

Step 5: In the Account Settings window that opens, click on the account you want to delete.

Step 6: Press Remove as shown below.

 

Account Remove

 

 

Step 7: Open the MS Outlook application and click on File Menu Option.

 

File From Menu

 

Step 8: In the Info tab, click on Add account button.

Add Account

 

 

Step 9: Enter your Email address and press on Connect. Follow the instructions shown to re-add the account.

 

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This will take some time to finish the configuration settings.

Step 8: Click on Finish. Now you can see the emails downloading.

Check if the issue has been resolved. If not, try the next fix.

Fix 3: Reconfigure the Windows Firewall

Step 1: Open the Run window using Windows + R

Step 2: Type control firewall.cpl, and hit the Enter key

 

 

control firewall

 

 

Step 3: From the left-hand side menu, click the Allow an app or feature through Windows Defender Firewall option

 

 

Allow An App Through

Step 4: In the opening window, locate the processes msimn.exe and Outlook.exe and enable both of them for the public as well as private networks.

Step 5: Finally, click on OK.

Step 6: Restart the System.

Check if the error disappears.

Fix 4: Repair the MS Office Application

Step 1: Hold the buttons Windows+r together.

Step 2: In the Run window, type appwiz.cpl, and click on the Enter key.

 

Appwizdcpl

 


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Step 3: In the Program and Features window that opens, locate Microsoft 365. Right-click on it and select Change.

 

Change Ms Office App

 

Step 4:  If the UAC pops up asking for permissions, click on Yes.

Step 5: In the appearing dialog, click on Quick Repair.

Step 6: Click on the Repair button.

 

Quick Repair Ms Office

 

Step 7: Follow the instructions shown and repair the Office programs.

Step 8: If the issue is encountered due to a corrupted Office 365 application, this fix will resolve the issue.

Step 9: Restart the application and check if the issue has been fixed. If not, try choosing Online Repair (instead of Quick Repair as in Step 6) to repair the Office apps.

 

Online Repair Ms Office

 

Step 10: Restart the application and check if the error has been fixed.

Fix 5: Delete your Account from Outlook App from Phone or Outlook Web

If you are seeing the error in MSOutlook (Desktop) and are able to send or receive the emails from Outlook Web or Outlook application on the phone, then try deleting the account from the mobile app and/or Outlook WebApp.

After deleting, when you try to send or receive the emails, you see that the issue resolves. Hope this helps.

 

That’s All.

We hope this article has been informative. Kindly comment and let us know the fix that has helped you solve the problem.

Thank you for Reading.

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