How To Fix Microsoft Outlook Error 0x80042109?

The Outlook error 0x80042109 generally occurs when you are unable to connect to the outgoing email server (SMTP). If you are getting this error message repeatedly in the Outlook app, try these troubleshooting steps.

Solution 1: Check the connectivity

  • Step 1: When you are unable to send emails from your Outlook, the first step is to check the Internet connection.
  • Step 2: Check your Internet connection. If it’s not stable enough, fix it first.
  • Step 3: If necessary, restart your router and modem.
  • Step 4: Switch to a wired connection to avoid connection issues.
  • Step 5: Restart your computer and disable the proxy and VPN temporarily.
  • Step 6: At last, run Windows troubleshooter and check if the Outlook sending reported error 0x80042109 is resolved.
  • Step 7: If the error reappears, execute the next solution to fix Microsoft Outlook error 0x80042109.

Solution 2: Check the SMTP settings

  • Step 1: Launch the Microsoft Outlook application and click the File tab.
  • Step 2: Select Info from the left-side panel and click on Account Settings below Account Information.
  • Step 3: In the Account Settings window, click the Email tab and choose your email account.
  • Step 4: Click the Change tab and check the email server settings on the POP and IMAP Account Settings screen.
  • Step 5: Verify if you have correctly entered the outgoing mail server name in the Server Information section.
  • Step 6: Click on More Settings to open the Internet Email Settings window.
  • Step 7: In the Outgoing Server tab, check if the My outgoing server (SMTP) requires authentication checkbox is selected.
  • Step 8: Also, check if the Use same settings as my incoming mail server option is enabled.
  • Step 9: In the Advanced tab, check if you have selected the correct security type and entered the correct SMTP server port.
  • Step 10: Click OK to save the settings.
  • Step 11: To verify the settings, click the Test Account Settings button.
  • Step 12: Once the verification is completed, click Next and select Finish.
  • Step 13: Restart Outlook and try to send a test email.
  • Step 14: If you can send the email, then the Outlook error 0x80042109 has been fixed.