Verification speed benchmarks
Compare the completion times we measured for bulk uploads and API batches.
The times below are for lists uploaded to the Bulk Verifier.
| List size | Verification time | Average rate |
|---|---|---|
| 10,000 | 2 min 46 sec | 60 emails/sec |
| 50,000 | 5 min | 167 emails/sec |
| 100,000 | 5 min 17 sec | 315 emails/sec |
| 250,000 | 6 min 38 sec | 628 emails/sec |
| 500,000 | 11 min 1 sec | 756 emails/sec |
| 1,000,000 | 20 min 53 sec | 798 emails/sec |
Benchmark times are approximate. Average rate is derived from the volume and total completion time; individual addresses may finish faster or slower.
On average, the API verifies a single address in this time. That's fast enough to check an address while someone is still completing your signup form.
The times below are for batches submitted through the API.
| Batch size | Verification time | Average rate |
|---|---|---|
| 1,000 | 52 sec | 19 emails/sec |
| 2,000 | 1 min 6 sec | 30 emails/sec |
| 3,000 | 1 min 20 sec | 38 emails/sec |
| 4,000 | 1 min 29 sec | 45 emails/sec |
| 5,000 | 1 min 21 sec | 62 emails/sec |
| 6,000 | 1 min 32 sec | 65 emails/sec |
| 7,000 | 1 min 43 sec | 68 emails/sec |
| 8,000 | 1 min 53 sec | 71 emails/sec |
| 9,000 | 2 min 7 sec | 71 emails/sec |
| 10,000 | 2 min 20 sec | 71 emails/sec |
| 20,000 | 4 min 1 sec | 83 emails/sec |
| 30,000 | 3 min 57 sec | 127 emails/sec |
| 40,000 | 3 min 38 sec | 183 emails/sec |
| 50,000 | 3 min 33 sec | 235 emails/sec |
| 60,000 | 3 min 29 sec | 287 emails/sec |
| 70,000 | 3 min 41 sec | 317 emails/sec |
| 80,000 | 4 min 23 sec | 304 emails/sec |
| 90,000 | 3 min 40 sec | 409 emails/sec |
| 100,000 | 3 min 51 sec | 433 emails/sec |
Benchmark times are approximate. Average rate is derived from the volume and total completion time; individual addresses may finish faster or slower.
Why verification time doesn't scale in a straight line
Verifying email addresses requires network responses. List size matters, but the mix of domains, mail server behavior, and the number of checks we can safely run at once all play a part too.
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Every list has a different mix
Popular mailbox providers often respond quickly, while smaller or more complex mail servers can take longer to verify.
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Some mail servers take longer
Verification depends on the speed of network responses. Slow servers, temporary failures, and anti-abuse limits can all add time.
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Larger lists run more checks at once
As a list grows, Emailable checks more addresses at the same time. That's why a list ten times larger won't necessarily take ten times longer.
Our Guarantees
We are committed to providing the fastest and most accurate email verification tool
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99% Deliverability Guarantee
We guarantee that no more than 1% of emails verified as Deliverable will bounce upon sending.
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40K+ Emails Verified per Minute
We verify emails over 8x faster than the competition, verifying 250,000 emails in under 7 minutes.
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99.99% Platform Uptime
Our secure and robust global infrastructure provides exceptional performance to customers around the world.
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24/7 Customer Support
Our team of experts are located around the globe and are available 24 hours a day.
Frequently Asked Questions
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We check more addresses at once as a list grows. Because verification also waits for mail servers to respond, ten times as many addresses won't necessarily take ten times as long.
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No. We speed up verification by checking more addresses at once, not by skipping checks. Every address goes through the same process and carries the same deliverability guarantee.
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The API is the best fit when single-address verification speed is critical to your application, such as checking an address while someone fills out a form. For larger lists, we recommend the Bulk Verifier.
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Your list may finish faster or slower depending on which mailbox providers it contains and how their servers respond. We benchmark for a realistic average, but individual lists vary and may take more or less time.