Free Email Validator —
Verify Any Address Instantly.
Check if an email address is valid for free online. Our free email verifier runs three layers of checks — syntax, DNS MX records, and live SMTP handshake — in under two seconds. No email sent, ever.
Want to verify thousands at once? Try our free bulk email verifier →
How the free email validator works
Syntax Validation
The validator instantly checks whether the address follows RFC-5321 formatting rules.
Catches typos, missing @ signs, and invalid characters
before any network request is made.
MX Record Lookup
We query the domain's DNS for MX (Mail Exchange) records. If none exist, the domain cannot receive email — so the address is invalid regardless of formatting.
SMTP Handshake
We connect to the mail server and simulate delivery using RCPT TO.
If the server rejects the mailbox, it's invalid — without ever sending an actual email.
Free Email Validator — FAQ
How do I verify an email address for free online?
Enter the address above and click Validate Free. The tool checks syntax, MX records, and SMTP — returning a result in under 2 seconds.
What does 'check if email is valid for free' actually test?
Three layers: (1) Is the address formatted correctly? (2) Does the domain have working mail servers? (3) Does the mailbox exist on those servers?
Why would an email pass syntax but fail SMTP?
The domain could be valid but the specific mailbox (e.g. john@example.com) may not exist. Only an SMTP check can catch this — syntax alone cannot.
What is a syntax error email check?
A syntax error email check validates that the email follows the correct format — proper local part, an @ symbol, a valid domain, and TLD. For example, 'user@@domain.com' or 'user@.com' would fail.
Can I verify email without sending an email?
Yes. Our SMTP check simulates the delivery process but disconnects before any message is transmitted. The mailbox owner never receives anything.
Need to validate a whole list?
Sign up free — 100 verifications/day, bulk CSV upload, disposable detection, and exportable results. No credit card required.
Create Free AccountAlso see: Bulk Email Verifier · Email Bounce Checker