How I Built an Email Validator That Detects Disposable Domains, Role Addresses, and Providers

You can validate most emails without sending them. Here's my 4-layer approach. Layer 1: Format RFC 5322 regex catches obvious invalids. Layer 2: MX Records const mx = await dns . resolveMx ( domain ); if ( mx . length === 0 ) // undeliverable Layer 3: Provider Detection MX records reveal the provider: aspmx.l.google.com → Google Workspace *.protection.outlook.com → Microsoft 365 Layer 4: Disposable Check Blocklist of 25+ domains: mailinator.com, guerrillamail.com, yopmail.com... Bonus: Role Address Detection admin@ , info@ , support@ are role-based, not personal. Important for sales. Result { "verdict" : "VALID" , "provider" : "Google Workspace" , "isDisposable" : false } Free Email Validator on Apify — search knotless_cadence email-validator .