- Split monolithic exitrace.sh into focused lib/ modules - date_utils.sh: Date validation and generation functions - mx_lookup.sh: MX record lookup functionality - log_analyzer.awk: Core log analysis logic extracted from main script - Maintains full backward compatibility with existing interface - Improves maintainability, testability, and code organization 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>