verifykit
Free email verifier · no signup

Verify any email
in one second

Paste an address, see a real SMTP verdict — same engine our paying customers use, free for one-off checks.

Free · no signup · no card · uses our live API

Try these examples

What it checks

Six layers behind each verdict — every check happens before the result lands on your screen.

Syntax validation

RFC 5322 format checks — catches typos, missing @, malformed domains, illegal characters.

MX record lookup

Confirms the domain has active mail-exchange records. Filters dead domains and parking pages.

SMTP mailbox check

Opens an SMTP conversation up to RCPT TO to confirm the mailbox exists. No email is delivered.

Disposable filter

100,000+ throwaway domains, updated daily. Stops free-trial abuse and burner accounts.

Quality score

Every signal combined into a 0.0–1.0 score and quality grade — excellent · good · fair · poor.

Fast — ~200ms

Full SMTP path completes in 300–500ms. Fast mode (no SMTP) returns in ~100ms.

Ready for more?

Free for one. Paid for production

This page is great for ad-hoc checks. When you need to validate at scale, sign up — same engine, with API keys, bulk endpoints, and rate limits that make sense.

Drop the API into your signup

POST `/v1/verify` and get the same verdict you see here — programmatically, in production.

Bulk-verify entire lists

Upload CSVs or POST arrays. Clean thousands of addresses in minutes.

No SMS bill if you add 2FA

Same account also gets email-OTP 2FA at flat pricing. No Twilio account required.

Sign up freeOpen full playground

When you outgrow the tool

Production keys with rate limits, history, and SDK access. 14-day money-back guarantee.

20% off · first 3 months

Starter

$7.20/ mo
$920% off
$0.0018 / validation
  • 5,000 validations / month
  • real SMTP verification
  • single API key
  • validation history
Get Starter
20% off · first 3 months

Growth

$15.20/ mo
$1920% off
$0.0013 / validation
  • 15,000 validations / month
  • bulk validation
  • real SMTP verification
  • email OTP 2FA (25k/mo)
Get Growth
20% off · first 3 months

Pro

$39.20/ mo
$4920% off
$0.001 / validation
  • 50,000 validations / month
  • unlimited API keys
  • duplicate removal
  • webhooks & callbacks
Start with Pro
20% off · first 3 months

Unlimited

$199.20/ mo
$24920% off
$0.0001 / validation
  • unlimited validations
  • all Pro features
  • dedicated support
  • fair use up to 5M/mo
Get Unlimited

Free email verifier FAQ

Is the free email verifier really free?
Yes. No signup, no card, no rate-limit gate on this page. We use a session-shared key against our live API — exactly the same backend our paying customers hit.
How accurate is it?
97%+ on addresses where SMTP verification succeeds. Catch-all and locked-down domains are flagged as “risky” instead of guessed at.
Will my email be sent during verification?
No. The SMTP step ends at RCPT TO and disconnects. No message body, no inbox impact — the recipient never knows.
Can I use the verifier in my own code?
Yes — POST to /v1/verify with your API key. Plain HTTP works, SDKs exist for Node.js and PHP for typed responses and retries.
What does each verdict mean?
"SAFE" = mailbox verified, send away. "RISKY" = catch-all domain or partial verification — send at your own risk. "INVALID" = mailbox does not exist or domain has no MX records.
Can I check email lists in bulk?
For one address at a time, use this tool. For lists, sign up — bulk verification is included from the Growth plan.

Verify at scale today

One-off checks above. API keys, bulk endpoints, and unlimited verifications when you sign up.

Get startedRead docs