Email Validation Without Sending Emails — MX Records, Disposable Detection, Provider ID

You can validate 90% of email addresses without sending a single test email. 4 Checks You Can Do Programmatically 1. Format Check RFC 5322 regex. Catches typos and malformed addresses. 2. MX Record Lookup import dns from " dns/promises " ; const mx = await dns . resolveMx ( " company.com " ); // If empty → email undeliverable 3. Provider Detection From MX records: aspmx.l.google.com → Google Workspace *.protection.outlook.com → Microsoft 365 *.protonmail.ch → ProtonMail 4. Disposable Domain Check Maintain a blocklist: mailinator.com, guerrillamail.com, yopmail.com, etc. Output { "email" : "user@company.com" , "isValidFormat" : true , "hasMxRecords" : true , "provider" : "Google Workspace" , "isDisposable" : false , "verdict" : "VALID" } Free Email Validator on Apify — search knotless_cadence email-validator .