AtDoor Email Validator · Coming soonStop fake emails before they enter.
AtDoor Email Validator checks syntax, DNS and MX records and whether the mailbox exists, without sending an email, and flags disposable and catch-all addresses. Add it to signup and login forms in minutes.
How it works
Get your keys
A public key for browsers, restricted to your domains, and a secret key for your server.
Add the script tag
It checks email fields as people type and blocks submit for invalid and disposable addresses.
Re-check on your server
Before creating a user, send the email to the API with your secret key. If the service can’t be reached, let the signup through.
What you get
Stop fake and disposable emails at signup with one API call or one script tag.
Mailbox check, no email sent
A live SMTP handshake confirms the mailbox exists. It only runs when cheaper checks can’t decide.
Disposable & catch-all flags
Catch throwaway inboxes and domains that accept anything.
One clear answer
Every result is valid, invalid, risky or unknown, with a score, a reason and a typo suggestion.
Fast
Checks run cheapest first with cached DNS, keeping median latency under 300ms.
Pay for answers only
Credits never expire, and unknown results are always free.
Works where you do
REST API, a browser widget and a WordPress plugin for WooCommerce and Contact Form 7.
Who it’s for
- SaaS products fighting fake signups
- Online stores and WordPress sites
- Teams cleaning marketing lists and bulk imports
Questions about AtDoor Email Validator?
Tell us what you need and we’ll help you get set up.