Overview
When sending emails to the same address, you may encounter the error "550 5.7.1 Authentication Required," which can occur due to spoofing detection by email security systems like Trend Micro. This article provides a solution to configure your email settings to allow such emails to be sent successfully.
Information
To resolve the issue of emails being rejected with the error "550 5.7.1 Authentication Required" when sending to the same address, follow these steps:
- Identify the Email Security System: Determine if your email system uses a security service like Trend Micro that might be detecting the email as spoofing.
- Access Trend Micro Settings: Log in to your Trend Micro account and navigate to the SMTP relay settings.
- Whitelist the IP Address: Add the IP address of your Kerio Connect server to the "Allow relay only for option, a group of IP addresses" in the Trend Micro settings. This will permit the relay of emails from this IP address without authentication errors.
- Test the Configuration: After making the changes, send a test email to the same address to ensure that the error no longer occurs.
- Monitor and Adjust: If the issue persists, consult with Trend Micro support for further configuration options or adjustments.
Frequently Asked Questions
- What does the error "550 5.7.1 Authentication Required" mean?
- This error indicates that the email system requires authentication to send emails, which can occur if the system detects potential spoofing, especially when the sender and recipient are the same.
- How can I prevent emails from being rejected due to spoofing detection?
- You can prevent this by whitelisting the IP address of your email server in the security system settings, allowing it to relay emails without triggering spoofing detection.
- What should I do if whitelisting the IP address does not resolve the issue?
- If the problem persists after whitelisting, contact your email security provider's support team for further assistance and explore additional configuration options.
Priyanka Bhotika
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