During October 2025, Mitch Green enhanced security and deliverability features across the sublime-security/sublime-rules and sublime-security/static-files repositories. He expanded impersonation detection by adding capitalonetradecredit.com to domain-based rules, improving threat detection for Capital One Trade Credit. In parallel, he broadened the list of high-trust sender root domains to include deluxe.com, supporting better email deliverability. Mitch’s work relied on YAML-driven configuration management and domain analysis, applying security engineering principles to extend detection coverage and trust signals. The updates required careful cross-repository coordination and a focus on risk reduction, demonstrating depth in configuration management and threat detection without introducing new bugs.