Docs Error Library Authentication Errors Error 550-5.7.0: Mail Relay Denied

Error 550-5.7.0: Mail Relay Denied

What Is Causing This Error?

Error 550-5.7.0 occurs when an email server denies a request to relay mail. Common reasons include the sender not authenticating with the outgoing mail server, the recipient’s server marking the sender’s server as a spam source, or failing security checks.

Resolving the Error – Solution

To fix the 550-5.7.0 error:

  • Confirm SMTP authentication is enabled in your email client.
  • Ensure your email server settings are correct.
  • Check with your email provider if additional configuration is needed.

For WordPress users, configuring the Easy WP SMTP plugin can streamline this process by allowing easy setup of SMTP authentication, ensuring your emails comply with server requirements, and mitigating relay issues.

That’s it! Now you know how to fix Error 550-5.7.0: Mail Relay Denied.

If you’d like to learn how to troubleshoot other common errors, check out the following tutorials