Fake signups and throwaway emails (like Mailinator or 10MinuteMail) ruin email deliverability and pollute databases ByteShield API intercepts bad emails instantly at signup using FastAPI and async DNS checks. 🌐 Live MX Verification: Non-blocking async DNS lookup to verify active mail servers. 📦 Bulk Support: Validate up to 50 emails concurrently in one request. Includes a free tier on RapidAPI for testing and small apps.