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Email verification confirms that an address exists and can receive mail before you send to it. The email address is often the first piece of information a user gives you, and the quality of your list directly determines your deliverability. If over 10% of your emails are bad, less than 44% of your campaign gets delivered — and failing spam filters costs you real revenue.

First, the sending server queries DNS for the MX record of the domain (the part after the @). Then an SMTP connection is established with that mail server — or the next responsible server if it's unavailable — and the message is transferred. Finally, the recipient retrieves it via their mailbox client. Verification tests these same steps without sending an actual email.

Processing speed depends on the size and quality of the list, but our infrastructure verifies over 100,000 emails per hour per customer. Greylisted addresses automatically get a delayed second pass rather than being misclassified.

Data transmission is secured with 256-bit SSL. Your lists are encrypted, stored in accordance with our privacy policy, and accessible only to authorized personnel with login credentials. You can delete your data at any time.

No. Pay-as-you-go credits remain valid until you've used them — there is no expiration date.

No installation is needed. Sign up, upload your list (or connect an integration), and we take care of the rest entirely in the cloud.

Our service delivers a 99%+ accuracy rate — and we're confident enough to back it with the industry's only true 100% money-back guarantee on results.

Email databases decay by roughly 22.5% per year as people change jobs and abandon addresses. For large lists we recommend verifying at least once every two weeks; smaller lists are fine with a monthly pass. Or connect your CRM to Automated List Cleaning and never think about it again.

Yes — a real-time verification API for checking addresses at signup, plus a bulk API for verifying whole files programmatically. Code samples for cURL, Node.js, Python, and PHP are on the API page.

Every address is classified into one of six categories: Deliverable, Invalid, Disposable, Accept-all, Unknown, or Spam trap. You can download any segment separately — most senders export only the Deliverable segment.

Yes. Every new account receives 100 free credits — enough to test the service on a real sample of your list. No credit card required.

If you're not satisfied with the accuracy of your results, we refund your purchase in full. We're the only email verification service offering a true 100% money-back guarantee — it's why more than 80,000 users trust us.

No. Pay-as-you-go credits never expire — they stay in your account until you use them, whether that's next week or next year.

One credit verifies one email address, whether you verify it through the dashboard, the bulk uploader, or the real-time API. Duplicates within the same list are detected and removed before verification, so you never pay twice for the same address.

We are the only email verification service offering a true 100% money-back guarantee on results. If you're not satisfied with the accuracy of your verification results, contact us and we'll refund your purchase in full — no partial credits, no fine print.

Yes. Team accounts let you invite your colleagues to collaborate in the same workspace while drawing from one shared pool of credits, with no extra per-seat fees.

Pay-as-you-go is a one-time purchase: buy a block of credits and use them whenever you like. The monthly subscription gives you the same number of credits every month at a 20–30% lower rate — ideal if you verify continuously or run automated list cleaning.

The minimum purchase is 2,500 credits ($19 pay-as-you-go). Before buying anything, every new account gets 100 free credits to test the service on your own data.

Speed depends on the size and composition of your list, but our infrastructure verifies over 100,000 emails per hour per customer. Most lists are returned within minutes; addresses behind greylisting get an automatic second pass.

Yes. Volumes above 10 million emails qualify for enterprise pricing with custom rates, a dedicated account manager, and priority processing. Contact us for a quote.