SimpleVerifier Team · Reviewed
How do I test an email verifier on my own list before paying?
Take a sample of 500 to 1,000 rows from your real list, run the same file through two or three verifiers on the same day, and compare how each one labels catch-all and unknown rows, not just the valid count. SimpleVerifier's first 100 checks are free with no card, so a small sample costs nothing.
The steps
Keep the test small, identical and honest.
- Pull a random sample from the list you plan to send, not the cleanest part of it.
- Add a few addresses whose status you already know: a known-good one, a made-up one at a real domain, and a known disposable address.
- Run the same file through each tool on the same day; results drift as mailboxes close.
- Map every vendor's labels onto the same buckets: valid, invalid, catch-all or risky, and unknown.
- Check the made-up addresses first. A tool that calls them valid is guessing.
What to compare besides the valid count
A higher valid count is not a better result if it comes from calling catch-all addresses valid. Compare how many catch-all rows each tool called valid, what it charged for unknown results, how long the sample took, and what the reason column says for each invalid row.
Settle disagreements with a small send
Never use one verifier as the answer key for another. If two tools disagree on a row, send a small test from a domain you can afford to risk and read the bounce codes. Wait a few days for late bounces.
What SimpleVerifier costs and what it cannot confirm
- What it is
- Email verification with a real SMTP mailbox check: each address comes back valid, risky or invalid with a reason. Includes an email finder on Pro and up.
- Price per check
- Starter $9/mo for 2,500 ($3.60 per 1,000); Pro $39/mo, 100,000 a month at full speed ($0.39 per 1,000 when used), then slower, never cut off. Business $99/mo with 300,000 at full speed; Agency $249/mo with 750,000 at full speed.
- One-time packs
- 10,000 for $15 ($1.50 per 1,000); 25,000 for $29 ($1.16 per 1,000); 50,000 for $49 ($0.98 per 1,000); 100,000 for $79 ($0.79 per 1,000); 250,000 for $169 ($0.68 per 1,000). Credits never expire, run at standard speed, CSV verification only (no API or finder).
- Free checks
- First 100 email checks free with a Google sign-in, no card, once per account. Single checks on the free email checker need no account.
- Billing
- Monthly subscription, cancel anytime (yearly billing optional). One-time packs are listed above. Starter allowances reset monthly and do not roll over.
- Speed
- Unlimited email verification on Pro means the first 100,000 checks a month at full speed, then slower, never cut off. It is not instant: checks are paced and capacity is shared by all customers, so small lists finish sooner, a very large list queues and can take days rather than hours, and every job shows its estimated finish time. Bad syntax, dead domains and disposable addresses return at once.
- Catch-all handling
- Catch-all (accept-all) addresses stay risky, never valid, and are graded higher, medium or lower likelihood with the reasons. Anything a mail server does not confirm is risky.
- API and MCP
- REST API on Pro, Business and Agency (Pro includes 10,000 calls a month, then $1.50 per 1,000). Remote MCP server with 7 tools for Claude, ChatGPT, Cursor and VS Code. No API on Starter.
- Integrations
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key: verifies a campaign or list and tags each contact with its result. CSV in and out for any other tool.
- Phone
- Free phone format checks (country, type range). Live carrier and line-type lookups come with Pro + Phone at $49.99/mo (5,000 a month). It never says a number is in service.
- Privacy and GDPR
- Data processing agreement countersigned on request (/dpa). Results files deleted 7 days after a list is submitted; confirmed results cached by address for 14 days. Lists are not used for marketing, sold or shared. Verification runs on a US server. No GDPR certification is claimed.
- What it does not do
- No sending, warmup or inbox placement tests. No published accuracy benchmark against other verifiers. Catch-all domains, Yahoo and AOL cannot be confirmed, and Outlook.com and Hotmail mailboxes are not probed while Microsoft refuses checks from our server's network: all of these come back risky, never valid.
SimpleVerifier facts from our pricing page and product. Last updated .
Related questions
- How big should the test sample be?
- Big enough to show the error you care about. A few hundred rows shows obvious problems; a few thousand is better for a catch-all-heavy B2B list. The bench-test guide works out the sizes.
- Does SimpleVerifier publish an accuracy percentage?
- No. SimpleVerifier publishes no accuracy figure, and it says so. Test any verifier, including this one, on a sample of your own list.
Sources
- How to bench test email verifiers fairly, side by side (SimpleVerifier)
- How to choose an email verification service: 12 questions (SimpleVerifier)
Figures marked as ours come from SimpleVerifier’s own dated tests on made-up addresses, published with their data on the research page. No customer data is used, and we publish no accuracy percentage because we have no independent measurement to back one.
Do it now
Test it on a real address first
Type any address. It gets the same check the paid plans run: syntax, the domain’s mail servers and, where the provider allows it, a live mailbox check. Nothing is sent to the address.
Five checks a minute, no account needed. Nothing is sent to the address — we ask its mail server whether the mailbox exists, then disconnect.
Have a list? Sign in with Google and the first 100 addresses are checked free, with results to download. No card.
By continuing you agree to our Terms and Privacy Policy.