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Contact us
Questions about a result, the API, or a plan? Write to us and a person answers.
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Get in touch
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We typically respond within 24 hours
- Response
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24 to 48 hours
Monday to Friday
- Faster
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Check the API documentation
For technical questions and integration help
Frequently asked questions
How accurate is your email validation?
We use comprehensive checks - syntax validation, MX record verification, and live SMTP connection testing - so results are highly reliable for most common providers and business domains. No service can verify every address with 100% certainty, though: some servers (catch-all domains, greylisting, and providers like Outlook/Microsoft or Yahoo) intentionally hide whether a mailbox exists, and we honestly report those as "Unknown" rather than guessing.
Is your service free to use?
Single email checks are free and need no account. Bulk checks are free with a free account: up to 1,000 addresses per file and 1,000 verified addresses a month, and Unknown results are never counted. API access is included on every plan, the Free one too - it just needs a confirmed email address. Paid plans add monthly volume and a higher request rate.
Do you offer API access?
Yes. A REST API is included on every plan, the Free one too: register, confirm your email address, and generate a key in your account. Plans differ by monthly volume and request rate, not by whether the API is available. See the API documentation.