arrow_back All SMTP Errors
530

Authentication Required

The mail server requires authentication before accepting mail. You must log in to send.

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What This Error Means

SMTP error 530 means the server requires you to authenticate:

  • SMTP authentication (AUTH) is mandatory
  • Credentials were not provided
  • Server requires login before relaying mail
  • TLS/SSL connection may be required first
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Common Causes

  • no_accounts
    No Credentials Provided

    Your mail client or server isn't sending authentication credentials.

  • settings
    Auth Not Configured

    SMTP authentication is not enabled in your email client settings.

  • security
    TLS Required First

    The server requires a secure connection (STARTTLS) before accepting authentication.

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How to Fix It

1. Enable SMTP Authentication

In your email client settings, enable 'My outgoing server requires authentication' or similar option.

2. Enter Credentials

Provide your username (usually email address) and password for the SMTP server.

3. Use Secure Connection

Enable TLS/SSL for the SMTP connection. Try port 587 with STARTTLS or 465 with SSL.

4. Check App Passwords

If using 2FA, generate an app-specific password for your email client.

terminal Example Error Message

530 5.7.0 Authentication required
530 5.7.1 Client was not authenticated
530 Must issue a STARTTLS command first

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