Release | v1.0.0

Added

• SMTP server supporting ports 25 (SMT), 587 (submission), 465 (SMTPS)
• Two TLS modes:
  • none — Plain SMTP (intended for use behind reverse proxy)
  • manual — Server handles TLS directly with certificate files
• API key-based authentication using ByteSend API credentials
• Automatic email forwarding to ByteSend API endpoints
• Support for both implicit TLS (SMTPS) and opportunistic TLS (STARTTLS)
• Support for custom SMTP auth username via SMTP_AUTH_USERNAME environment variable
• Hot-reload functionality for TLS certificates (zero-downtime renewal)
• Structured logging with JSON output to stdout (systemd/Docker compatible)
• Environment variable validation with clear error messages

Changed

• Improved STARTTLS handling to prevent downgrade attacks
• Enhanced error messages for certificate loading failures

Fixed

• Proper cleanup of connections on server shutdown
• File watcher edge cases during certificate renewal

Security

• Added security policy and vulnerability disclosure guidelines