SMTP Error (535) – Authentication Failed
SMTP Error (535) - Authentication Failed
Discover solutions for resolving the SMTP authentication error when sending emails.
What is SMTP Error (535)?
The error message "Server says: 535 – Incorrect authentication data" indicates an issue with SMTP User Authentication. SMTP, or Simple Mail Transfer Protocol, is a standard used by mail servers to send and relay outgoing mail between email senders and receivers.
Common Causes of SMTP Error (535)
This error may occur in various scenarios, such as:
- Incorrect authentication details being used in your email client.
- Your SMTP service being disabled by your hosting provider.
- Issues with your email client configuration.
- Exceeding the maximum number of allowed authentication attempts.
Diagnosing the Issue
If you encounter the SMTP Error (535) when using services like Roundcube webmail or other mail clients such as Outlook, follow these steps:
- Verify that your SMTP authentication details (username and password) are entered correctly.
- Check your hosting account control panel under Account Usage to ensure that SMTP services are included in your plan.
Note: If your account SMTP is disabled, you will see an "SMTP OFF" notice at the top of your account usage page.
What to Do If SMTP is Disabled?
If your SMTP service is indeed disabled and your hosting plan does not include it:
- Review your current hosting plan to confirm whether SMTP is included.
- If SMTP is not available and cannot be upgraded, consider upgrading your hosting plan to one that offers SMTP services.
- For further assistance, check your support tickets or contact your hosting provider.
Tags: authentication failed, email client setup, Email errors, email sending issues, Outlook, Roundcube, SMTP Error 535, SMTP user authentication