SMTP issues can prevent email delivery. This guide helps diagnose and resolve common problems.
Connection Timeouts
Timeouts occur when the server doesn't respond. Check server address, port, firewall settings, and network connectivity.
Authentication Failures
Authentication errors indicate credential problems. Verify username, password, and authentication method. Use App Passwords if required.
TLS/SSL Errors
Encryption errors suggest certificate or protocol issues. Verify TLS settings, certificate validity, and supported protocols.
Relay Access Denied
Relay errors occur when the server rejects your email. Ensure authentication is enabled and credentials are correct.
Pro Tips
- Test with our SMTP tester to identify issues quickly
- Check server logs for detailed error information
- Verify DNS settings and server reachability
- Contact your email provider if problems persist