I just launched Email Validator API on RapidAPI — a professional email verification service built with Python and FastAPI. Most email validators only check syntax. Mine runs 4 layers of verification and returns a confidence score for every email. The 4 Layers Layer 1 — Syntax Check Validates format against RFC 5322 standards. Also detects common typos and suggests corrections — for example user@gmial.com → user@gmail.com . Layer 2 — DNS / MX Lookup Confirms the domain exists and is configured to receive emails using dnspython . Catches domains that look valid but can't receive mail. Layer 3 — Disposable Domain Detection Flags throwaway addresses from 3,000+ known providers like Mailinator, Guerrilla Mail, YOPmail and TempMail. Essential for preventing fake signups. Layer 4 — SMTP Verification Performs a real SMTP handshake to confirm the mailbox exists — without sending a single email. Available on Pro plans.…