Google Workspace Error Code 5.7.0: How to Fix It

Medium 10-20 minutes High Severity Verified June 2026
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Error Code
5.7.0 Authentication Required
Brand
Google Workspace
Product Type
productivity
Severity
High
DIY Difficulty
Medium
Estimated Fix Time
10-20 minutes
Google Workspace error code 5.7.0 occurs when your email client or application tries to send emails through Gmail's SMTP server without proper authentication. This security error means Gmail is blocking the connection because it requires an authenticated SASL (Simple Authentication and Security Layer) connection to prevent unauthorized email sending.
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Tools You'll Need

How to Fix Error Code 5.7.0 Authentication Required

  1. Enable 2-Step Verification on Your Google Account

  2. Generate an App Password

    Store the app password securely and never share it with others

  3. Update Email Client Settings

  4. Enable Less Secure App Access (If Available)

    This reduces security - only use as a last resort for legacy applications

  5. Configure OAuth 2.0 Authentication

  6. Test the Connection

  7. Check Google Workspace Admin Console

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When to Call a Professional

Contact your IT administrator if you're in a corporate environment with restricted Google Workspace settings. If you continue getting authentication errors after following all steps, contact Google Workspace support, especially if this affects multiple users in your organization.

Frequently Asked Questions

What does Google Workspace error 5.7.0 mean?
Error 5.7.0 means Gmail's SMTP server is rejecting your email because it requires proper authentication. This happens when your email client isn't using the correct credentials or authentication method to send emails through Gmail.
Why do I need an app password for Gmail SMTP?
App passwords provide a secure way for email clients to access Gmail without using your main account password. They're required when you have 2-step verification enabled, which is necessary for enhanced security.
Can I still use less secure app access with Google Workspace?
Google has largely disabled less secure app access for new accounts and is phasing it out entirely. The recommended approach is to use app passwords with 2-step verification or OAuth 2.0 authentication for better security.
What are the correct Gmail SMTP settings?
Use smtp.gmail.com as the server, port 587 with STARTTLS encryption, or port 465 with SSL. Always enable authentication and use either an app password or OAuth 2.0 for the login credentials.
Why does the error happen suddenly if it worked before?
Google regularly updates security policies and may disable less secure authentication methods. Your email client might need to be reconfigured with app passwords or OAuth 2.0 authentication to maintain access.

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