Email Validator
Verify any email address instantly. Check syntax, DNS records, and SMTP mailbox existence to ensure deliverability.
How It Works
Syntax Check
We validate the email format against RFC 5322 standards. This catches typos, missing @ symbols, invalid characters, and malformed addresses.
DNS / MX Verification
We query the domain's DNS records to verify MX records exist. This confirms the domain is configured to receive email messages.
SMTP Mailbox Check
We connect to the mail server and verify the specific mailbox exists without sending an email. This is the deepest level of verification.
Frequently Asked Questions
How does email validation work?
Email validation checks three layers: syntax validation (RFC 5322 compliance), DNS/MX record verification (confirms the domain can receive email), and SMTP mailbox verification (connects to the mail server to check if the address exists). Each step provides increasing confidence in deliverability.
Is this email validator free?
Yes, our email validator is completely free to use with fair-usage rate limits. You can validate individual addresses without signing up. For bulk validation of thousands of addresses, contact us about our enterprise API with higher throughput.
Does validation send an email to the address?
No. Our validator connects to the SMTP server and checks if the mailbox exists without actually sending any email. This is a non-intrusive verification process that won't trigger any notifications to the email owner.
Why should I validate email addresses?
Validating emails reduces bounce rates, protects your sender reputation with ESPs like SendGrid and Mailgun, saves money on email marketing campaigns, and ensures you're reaching real recipients. High bounce rates can lead to your domain being blacklisted.
Need Bulk Email Validation?
Validate thousands of email addresses with our enterprise API. Custom rate limits, webhooks, and dedicated support.