Question : How to Fix Error 5.7.1 (Relay Access Denied)

What is Error 5.7.1?

Error 5.7.1 occurs when the email server does not allow relaying of emails to external domains. This error is often caused by:

• Improper or missing SMTP authentication.
• The sender is not authorized to send emails through the SMTP server.
• Misconfigured email client settings or server policies.

This error essentially means the server has denied permission to relay the email to its destination.

How to Fix Error 5.7.1?

Follow these steps to resolve Error 5.7.1:

1. Enable SMTP Authentication:
   • Ensure that SMTP authentication is enabled in your email client settings.
   • Look for options like "My outgoing server (SMTP) requires authentication" and check this setting.
2. Verify SMTP Server Credentials:
   • Check that the username and password for the SMTP server are correct.
   • If you’ve recently changed your password, update it in your email client.
3. Use the Correct Outgoing Mail Server:
   • Make sure you’re using the SMTP server provided by your email hosting service.
   • For example, if your email is hosted with example.com, your SMTP server might be smtp.example.com.
4. Verify Email Address Authorization:
   • Ensure the email address you’re using to send emails is authorized to use the SMTP server.
   • Contact your email service provider if you’re unsure about the authorization status.
5. Check Server Policies:
   • Some email servers restrict relaying to certain domains or require specific settings. Consult your email provider for guidance.

Preventing Error 5.7.1 in the Future

• Always use the correct SMTP settings as provided by your email hosting service.
• Keep your email client software and server configurations up-to-date.
• Regularly verify your authentication credentials and ensure they are secure.
• Consider using an email platform like Mailpro to simplify email authentication and avoid misconfigurations.

By following these steps, you can resolve Error 5.7.1 and prevent it from occurring in the future. If issues persist, contact your email hosting provider for further assistance.

See the List of most Common SMTP Errors