MailValidation.io checks every address in real time — catching typos, disposable domains, and fake signups before they cost you a bounce, a blocklist, or a wasted send.
One API, one dashboard, every check that matters.
We connect directly to the recipient's mail server to confirm the mailbox actually exists — not just that the domain has valid MX records.
Flag throwaway inboxes and catch-all domains automatically so you know exactly how confident to be in each result.
Upload a CSV and validate thousands of addresses at once. Get a clean, ready-to-send list back in minutes.
Drop validation straight into your signup flow with a single API call — full docs, sensible rate limits, no surprises.
Most checks complete in under a second, so you can validate right at the point of signup without slowing anyone down.
Embed a validation widget on any form, or get results pushed to your systems automatically via webhook.
Three steps, under a second, no guesswork.
Via the API, a CSV upload, or our embeddable widget on your signup form.
We verify the domain, confirm the mailbox exists at the recipient's server, and check for disposable or catch-all patterns.
Deliverable, undeliverable, risky, or unknown — with the detail behind the verdict.
Start free. Pay only for what you validate.
Create a free account and validate your first addresses in minutes.
Get Started Free