I Validate Emails Without Sending Them — Here Is How

Email validation doesn't require sending a test email. Here's what you can check programmatically: 1. Format Validation Regex check for RFC 5322 compliance. Catches obvious typos. 2. MX Record Lookup import dns from "dns/promises"; const records = await dns.resolveMx("stripe.com"); // [{priority: 1, exchange: "aspmx.l.google.com"}, ...] If no MX records exist, the email is undeliverable. 3. Provider Detection From MX records, detect the email provider: Google Workspace → aspmx.l.google.com Microsoft 365 → *.protection.outlook.com ProtonMail → *.protonmail.ch 4. Disposable Domain Detection Maintain a list of known disposable domains (mailinator.com, guerrillamail.com, etc.). Flag these emails. 5. Role Address Detection Addresses like admin@, info@, support@ are role-based — usually not individual people. Important for sales outreach. Combining Everything My Email Validator tool on Apify outputs: { "email": "[email protected]", "isValidFormat": true, "hasMxRecords": true, "provider": "Goog