Free Email Validation API — Catch Disposable & Invalid Emails Before They Hit Your Database

Bounced emails kill your sender reputation. Disposable emails pollute your user base. And most email validation APIs charge $50+/month before you even see a result. I built a free Email Validation API on Cloudflare Workers that checks: Syntax validation (RFC 5322 compliant) MX record verification (does the domain actually accept email?) Disposable email detection (1,000+ throwaway domains) Role-based address detection (info@, support@, admin@) Free provider detection (Gmail, Yahoo, Outlook, etc.) All in one API call , with sub-50ms response times from 300+ edge locations worldwide. Quick Start curl "https://email-validation-api.t-mizuno27.workers.dev/validate?email=test@gmail.com" Response: { "email" : "test@gmail.com" , "valid" : true , "disposable" : false , "role_based" : false , "free_provider" : true , "mx_valid" : true , "domain" : "gmail.com" , "suggestion" : null } Use Cases 1. Form Validation (Frontend) async function validateEmail ( email ) { const res = await fetch ( `https: