Buyer guide · SimpleVerifier Team
Email verifiers that don't charge for unknown results or duplicates
Many credit-based verifiers say they do not charge for unknown results or duplicates; some charge a normal credit, and some give credits back afterwards. The vendor-by-vendor rules, read from each vendor's own page with the date, are below. On SimpleVerifier Pro ($39 a month) nothing is charged per result at all, and on Starter unknowns and duplicates do not count.
Unknown results matter because they are not rare on B2B lists: servers that time out, greylist or refuse to answer all end in unknown. On a credit plan, whether those rows cost a credit changes the real price per usable result.
Our rules, from the plan constants. Unknown results: Not charged on Starter: addresses we can't check don't count. Pro, Business and Agency have no per-email charge at all. Duplicates: Not charged: each unique address in a file counts once. Catch-all: Counted as one check on Starter, because every catch-all row is graded higher, medium or lower likelihood. No per-email charge on Pro and up. A catch-all row is never marked valid.
SimpleVerifier facts: prices, packs and limits
- 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 today
- One sending IP today, shared by every customer: about 13,000 mailbox checks a day in the standard lane. Bad syntax, dead domains and disposable addresses return at once; a list of 100,000 takes days, not hours, and each job shows its estimated finish time.
- 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 6 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 .
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.
How each vendor bills unknowns and duplicates
ZeroBounce, read 30 Oct 2026. Unknown results: Not charged. Its FAQ: "we will never charge you for 'unknown' results." Duplicates: Not charged: "nor will we charge you for removing duplicate email addresses from your list."
NeverBounce, read 30 Oct 2026. Unknown results: Not stated on the pages we read. Duplicates: Not charged on Growth: "Only pay for new, unique emails - duplicates are free."
Hunter.io, read 30 Oct 2026. Unknown results: Not charged: "If we fail to verify, no credit is counted; in this case, the verification status returned is Unknown." Disposable addresses are skipped with no credit counted. Duplicates: Counted once: the same verification is counted once per billing period.
Clearout, read 30 Oct 2026. Unknown results: Not charged. Its FAQ says addresses that cannot be determined because of a timeout or no response are not billable. Duplicates: Not charged within the same uploaded list.
Kickbox, read 30 Oct 2026. Unknown results: Refunded as a credit: "If we can't provide a definitive result to you, we'll refund the credit." Duplicates: Not stated on the pages we read.
Bouncer, read 30 Oct 2026. Unknown results: Not charged. Its pricing FAQ: Bouncer "will never charge for duplicated email addresses within your list, nor for 'unknown' results." Duplicates: Not charged, in the same FAQ answer as unknown results.
DeBounce, read 30 Oct 2026. Unknown results: Not charged. Its Apollo integration page: "Duplicates and unknown results are not charged." Duplicates: Not charged: "We remove duplicates at no extra cost - you never pay for duplicates."
EmailListVerify, read 30 Oct 2026. Unknown results: Not stated on the pages we read. Duplicates: Not stated. Its FAQ mentions email deduplication but not whether duplicates cost a credit.
Emailable, read 30 Oct 2026. Unknown results: Refunded. Its page: "Credits spent on Unknown results and duplicates are returned to your balance when your list finishes verifying." Duplicates: Refunded, in the same sentence as unknown results.
MillionVerifier, read 30 Oct 2026. Unknown results: Credits come back. Its help center says it automatically adds back the credits used for risky emails (unknown and catch-all) once the job finishes, as credits, not money. Accounts it flags for misuse pay for risky emails. Duplicates: Not stated on the pages we read.
Reoon, read 30 Oct 2026. Unknown results: Not charged. Its FAQ says it will never charge a credit for unknown results, refunded automatically when the task finishes. Duplicates: Not stated on the pages we read.
Verifalia, read 2 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not charged: its page says duplicated emails can be removed from results and are always free of charge.
Truelist, read 2 Nov 2026. Unknown results: Its page says standard validation "costs 1 credit per email with a definitive verdict", and that an unknown result is what triggers the enhanced check; it does not say more about billing for unknowns. Duplicates: Not stated on the pricing page.
Proofy, read 3 Nov 2026. Unknown results: Not charged. Its pricing page: "you are never charged for duplicates or unknown addresses." Duplicates: Not charged, in the same sentence as unknown addresses.
BounceBan, read 3 Nov 2026. Unknown results: Its FAQ says 1 credit is needed for every successful verification; it does not say more about unknown results. Duplicates: Not stated on the pricing page.
Scrubby, read 3 Nov 2026. Unknown results: Not stated. Its FAQ says Scrubby turns risky unknowns into valid or invalid results rather than leaving them unresolved. Duplicates: Not stated on the pages we read.
Bounceless, read 4 Nov 2026. Unknown results: Not charged. Its FAQ: "Unconfirmed verification results are not billed." Duplicates: Not stated on the pricing page.
Bulk Email Checker, read 4 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
Captain Verify, read 4 Nov 2026. Unknown results: Not charged. Its pricing page: "The unknowns are recredited." Duplicates: Not charged. Its FAQ: "We do not count unknown verifications and duplicates."
Listclean, read 4 Nov 2026. Unknown results: Not charged. Its FAQ: "Unknown results do not deduct credits." Duplicates: Not charged: "Duplicate addresses are detected and skipped automatically."
MyEmailVerifier, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
EmailVerify.io, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
Verimail, read 5 Nov 2026. Unknown results: Not charged. Its pricing page: "Unknowns, duplicates and syntax errors never charged." Duplicates: Not charged within a file, per its FAQ.
Clearalist, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Every pack lists free deduplication; the page does not say whether removed duplicates spend credits.
EmailOversight, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
SafetyMails, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
BillionVerify, read 5 Nov 2026. Unknown results: Not charged. Its FAQ: "Unknown results are free, so a mail server that refuses to answer never costs you a credit." Duplicates: Not stated on the pricing page.
Emails Checker, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
Email Verifier API, read 5 Nov 2026. Unknown results: Not charged. Its FAQ: "You are not billed for indeterminate "unknown" (catch-all) outcomes." Duplicates: Not stated on the pricing page.
VeriMails, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Not stated on the pricing page.
Selzy, read 5 Nov 2026. Unknown results: Not stated on the pricing page. Duplicates: Counted once: its verifier page says only unique contacts in a file are counted, and duplicates pasted as text count once.
Why a flat plan sidesteps the question
On a monthly plan with no per-email charge, an unknown, a catch-all and a duplicate all cost the same: nothing extra. Pro is $39 a month, never cut off: the first 100,000 emails a month run at full speed, then big lists run slower. It is not the lowest price at a few thousand addresses a month; the cost comparison shows where metered vendors cost less.
Common questions
- Do email verifiers charge for unknown results?
- It varies by vendor. Several say they do not; others charge a normal credit or credit it back afterwards. The vendor-by-vendor rules on this page are quoted from their own pages with the date read.
- Do email verifiers charge for duplicates?
- Most that state a rule count each unique address once. SimpleVerifier: Not charged: each unique address in a file counts once.
- Does SimpleVerifier charge for unknown results?
- Not charged on Starter: addresses we can't check don't count. Pro, Business and Agency have no per-email charge at all.
Verify without per-result billing
Pro is $39 a month and never cuts you off: the first 100,000 emails a month run at full speed, then big lists run slower. CSV uploads, the API (10,000 calls a month, then $1.50 per 1,000), the Google Sheets add-on and the email finder are included, and you can cancel any time. For smaller volumes, Starter is $9 a month for 2,500 emails a month.
The first 100 email checks are free with a Google sign-in, no card, on the same engine the paid plans use.