Free Email Checker — Verify 10,000 Emails per Month

Instant email verification — syntax, DNS/MX, SMTP probe, catch-all, disposable, typo suggestions and a 0-100 deliverability score. No signup, no install, 98% accuracy.

🛡️ … emails verified · … disposable domains blocked

What this free email checker does

• Syntax check against RFC 5321/5322 (catches typos instantly).
• Domain & MX lookup — is the recipient domain real and configured to receive mail?
• SMTP handshake with the mail server to confirm the mailbox exists.
• Disposable detection — blocks 10minutemail, Mailinator and 15k+ temp-mail providers.
• Role-based flag — warns when the address is info@, sales@ etc.
• Catch-all detection — flags domains that accept every address without verifying.

When to use it

• Before adding a contact to your CRM.
• Validating a single signup by hand.
• Investigating a suspicious email address.
• Testing a recovered contact from an old backup.
• Quality-checking a sample from a large list.

Free email checker vs paid bulk verifier

The free single-address checker is perfect for one-off lookups. When you have hundreds or thousands of addresses to verify, the bulk email cleaner processes CSVs in minutes and returns a per-row verdict. Bulk pricing starts at $0.001/email and the first 200 every month are free.

FAQ

Is this really free?

Yes. 200 free checks per month, renewing monthly. No credit card to start.

How accurate is the free email checker?

98% on representative lists. Catch-all domains are the only hard ceiling.

Does checking an email actually send mail?

No — we probe the recipient server with a RCPT TO command and close the connection before any DATA is transmitted. Nothing lands in their inbox.

How do I check many emails at once?

Use the bulk cleaner — upload a CSV and download an enriched file with status columns.

Free email checker vs. competitors

API preview

Prefer programmatic access? Two lines of cURL:

curl -X POST https://kaijuverifier.com/api/validate-email \
  -H 'Content-Type: application/json' \
  -d '{"email":"test@example.com","use_smtp":true}'

Full API docs → · Get an API key (raises rate limits).