MailValidation.io
Fast, accurate email validation. Reduce bounces, protect your sender reputation, and keep your lists clean.
No credit card required · 100 free validations
No credit card required · 100 free validations
Enter a single address, upload a CSV, or call our REST API.
Syntax, DNS, MX, SMTP, disposable & catch-all checks — all in seconds.
Valid, invalid, or unknown — with full details. Export as CSV or use via API.
Real-time RCPT TO checks against the recipient's mail server to confirm the mailbox exists.
Detects temporary / burner email providers so you can block throwaway signups.
Validates domain DNS records, MX configuration, and nameserver health.
Identifies domains that accept all addresses — so you know when a "valid" result may be unreliable.
Flags role-based addresses (info@, admin@, support@) that often can't receive marketing email.
Validate emails programmatically with our simple JSON API. API key auth, rate-limited, documented.
Add real-time email validation to any form with one line of JavaScript. Blocks bad emails before they enter your database.
100 validations / month
5,000 validations / month
50,000 validations / month
"I use MailValidation.io at the point of email collection on all my forms and subscriptions to eliminate burner emails and SMTP non-deliverable emails from ever getting into my database and it is amazing."