Dealing with the Yahoo server authentication failure issue in Mailbird can be frustrating but do not worry about it. The issue can be sorted out by the quick and simple steps provided on this page. Go through the steps and execute them. 

Why do you see Yahoo server authentication failed error in Mailbird?

There are many reasons which can make the application cease to work. Sometimes the antivirus or firewall on your system can also be a reason for such an issue. Otherwise, it may be an outdated application or server issue or even an unstable network connection issue. Try to refresh your Yahoo Mail account or you can also restart your computer. Now open the application and enter your valid username and password in their respective fields. If you still encounter a similar problem, then carry on to the troubleshooting steps. 

Method 1: Refresh your account

  • Step 1:Refresh the Mailbird application and try to login into your Yahoo Mail account.
  • Step 2:Alternatively, close all the running applications on your computer and restart your system. 
  • Step 3:Now launch Mailbird on your computer and log into your Yahoo account.

If you still experience the server authentication failed issue, then continue with the following method.


Method 2: Try another browser

The problem might be with the email server or the server settings or any other Internet glitch in the Mailbird app. Sometimes, this error occurs when Mailbird is not allowed to access your email account. Try to log in to your Yahoo account from a different browser. This may resolve the issue. If the problem persists, then carry on with the following step.


Method 3: Disable the security features

  • Step 1:The Yahoo server authentication failed issue in Mailbird can be due to the security features in Yahoo. Follow the steps to disable the security features.
  • Step 2:Sign in to your Yahoo account and go to the Account Security settings.
  • Step 3:Now, turn enable Allow apps that use the less secure sign-

Check whether the authentication problem is fixed. If the issue persists, contact our technical team for further assistance.

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