You can configure your Yahoo Mail account as an IMAP or POP3 account in the Mailbird app. If Mailbird displays the Server Authentication Failed message, troubleshoot it with the quick steps given on this page. In most cases, the authentication failed error message occurs when the email server is down. You have to reauthenticate your email account to fix this problem. Sometimes, users may configure the server settings incorrectly and end up with a server authentication error. In such cases, contact our technical experts to assist you

in resolving Mailbird Yahoo server authentication failed.

Solution 1: Enable Less Secure Apps In Yahoo Mail

  • Step 1: On your computer, close the Mailbird app and launch the default browser.
  • Step 2: Navigate to the Yahoo sign-in page and enter your login credentials in the required fields to access your Yahoo Mail account.
  • Step 3: Click the Settings icon at the top-right corner and select the Account Info option from the drop-down list.
  • Step 4: Select Account Security from the left-side panel and scroll down the page to the bottom.
  • Step 5: Toggle on the slider Allow apps that use less secure sign in.
  • Step 6: Log out from your Yahoo Mail account and launch the Mailbird app.
  • Step 7: Try sending a test email and check if the Mailbird Yahoo server authentication failed error reappears.

Solution 2: Check The Mail Server Settings

  • Step 1: In the Mailbird app, click the Menu button at the top-left corner.
  • Step 2: Select the Settings option followed by Accounts from the left-side panel.
  • Step 3: Double-click your Yahoo account that shows Server Authentication Failed message.
  • Step 4: Under Incoming server, verify the incoming mail server name in the Server name field.
  • Step 5: Make sure to choose the correct server type (IMAP/POP3) for your Yahoo account.
  • Step 6: In case you have selected SSL/TLS as your encryption type, enter the secure server port number in the Port field (993 for IMAP and 995 for POP).
  • Step 7: Also, check whether you have correctly entered the email address and password for your Yahoo Mail account in the Username and Password fields.
  • Step 8: Below Outgoing server, ensure that you have entered the correct outgoing mail server name in the SMTP server field.
  • Step 9: Verify that you have selected the Requires authentication checkbox.
  • Step 10: Click Continue and save the configured settings.
  • Step 11: Restart your Mailbird app and check if the problem has been resolved.
  • Step 12: If Mailbird Yahoo server authentication failed error displays again, remove and re-add your Yahoo account.
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