MailGate detects disposable, fake & fraudulent emails using a bundled list of 8,400+ blocked domains + live DNS/MX checks with zero external API calls. Features: → Offline-first, works without internet → Typo detection (gmial.com → gmail.com) → Bot username analysis → Parked & temp domain detection → Returns ALLOW / FLAG / BLOCK with risk score 0–100 Use as npm library, CLI tool, or self-hosted REST API.