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How to Fix the “Server Authentication Failed” Error in Mailbird Next

  1. Mailbird Next for Mac & Windows
  2. Troubleshooting
  3. Authentication Problems
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Oliver Jackson
  • April 18, 2026 09:54
  • Updated

Overview

If you see a "Server authentication failed" error when using Mailbird Next, don’t worry—it’s an issue which is normally very simple to resolve. This error can appear with many types of email accounts, including Yahoo, Hotmail, and several others.

🔍 Why This Might Happen

This error typically occurs when your email server loses authentication. This is usually due to an internal server issue on your provider’s side and is not caused by Mailbird Next.

✅ How to Fix It

The quickest and most effective solution is to remove and re-add your email account in Mailbird Next. Here’s how:

  1. Go to Settings in Mailbird Next.

  2. Navigate to the Accounts section.

  3. Remove the affected email account.

  4. Add the account again by entering your email address and password when prompted.

This will reauthenticate your account and usually resolves the issue immediately.

💬 Need More Help?

If the problem persists, contact our Customer Happiness Team. We’ll be happy to assist you further and get things back on track!

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