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‎11-21-2025
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Troubleshooting Tip: SMTP STARTTLS connection fails with code: 18 self-signed certificate

11-21-2025
Description This article describes how to identify and troubleshoot self-signed certificates in SMTP server configuration. Scope FortiAuthenticator. Solution When configuring an SMTP server with 'STARTTLS' as 'Secure connection' setting, it is requir...
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