Free Email Verifier
Check whether an email address really exists before you send. You get a strict yes/no: catch-all and unverifiable mailboxes count as no.
How it works
We check syntax, the domain's mail servers, disposable and role addresses, and whether the mailbox accepts mail - without sending an email.
Free: 3 checks per day. Need more? Sign up for 100 free checks a month, or verify addresses from your code with the API. For signup forms, the API's mode=fast is free and answers in under a second.
Automate it with the API
Run this check for every address in your product, from any language.
curl -X POST https://www.mailrambo.com/v1/verify \
-H "Authorization: Bearer $MAILRAMBO_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "jane@acme.com"}'API reference · Get a free API key
Building email/password signup with Better Auth? Use MailRambo's server-side screening plugin. Fast screening does not confirm mailbox existence; keep email confirmation enabled.
Frequently asked questions
Is this email checker really free?
Yes - 3 checks a day with no signup. A free account adds 100 checks a month plus API access.
Why is a catch-all address marked not deliverable?
Catch-all servers accept every address during the check, so the real mailbox can't be confirmed. Many of those messages bounce later, so we answer no.
Do you send an email to the address?
No. Verification talks to the mail server without sending a message.
Can I verify emails in bulk?
Yes. Upload a CSV in the dashboard, or use the batch API for up to 200 addresses per call.
Related tools
Disposable Email Checker
Detect throwaway and temporary email addresses.
Email Syntax Checker
Validate email format and catch typos like gmial.com.
Free & Role Email Checker
Detect free-provider (Gmail, Yahoo) and role (info@, sales@) addresses.
MX Record Lookup
See a domain's mail servers, priorities and email provider.
Run these checks from your code
Verify addresses at signup, clean lists and read SPF/DKIM/DMARC with one API call. 100 free verifications a month, test keys that cost nothing, and the API on every plan.