Unlimited email verification: flat price, no credits, never cut off
Quick answer: Yes, with a qualifier. SimpleVerifier Pro ($39/mo), Business ($99) and Agency ($249) are flat-price email verification with no credits and no cap: never cut off, with the first 100,000, 300,000 or 750,000 checks a month at full speed, then big lists run in a paced lane. Almost every other verifier sells credits; NeverBounce lists unlimited usage only on custom Enterprise pricing. No accuracy test was run.
By SimpleVerifier Team · Last updated · Prices and limits checked on each vendor’s own site
Unlimited email verification from $39/mo
No cap, never cut off. Fair use: the first 100,000 checks a month run at full speed, then big lists run in a paced lane.
Business ($99) runs the first 300,000 a month at full speed and Agency ($249) the first 750,000. Unlimited covers email verification only: API calls, phone lookups and the email finder have their own limits.
Is there an unlimited email verification plan?
Yes: SimpleVerifier Pro ($39/mo), Business ($99) and Agency ($249) are unlimited email verification with no cap and no credits, never cut off: the first 100,000, 300,000 or 750,000 checks a month at full speed, then big lists run in a paced lane. API calls and phone lookups are metered. Starter is capped. The first 100 checks are free.
- 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.
- 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 .
How unlimited works on SimpleVerifier
No plan stops you or charges per email. Each plan has a monthly full-speed volume; past it, big lists (2,000+ rows) keep running in a paced lane until the month resets. Small lists always run first on every plan.
| Plan | Email verification | API calls (metered) |
|---|---|---|
| Pro$39/mo | Unlimited, never cut off. First 100,000 a month at full speed, then paced. | 10,000 a month included, then $1.50 per 1,000 on monthly billing |
| Business$99/mo | Unlimited, never cut off. First 300,000 a month at full speed, then paced. | 100,000 a month included, then $1.00 per 1,000 on monthly billing |
| Agency$249/mo | Unlimited, never cut off. First 750,000 a month at full speed, then paced. | 300,000 a month included, then $1.00 per 1,000 on monthly billing |
- Not unlimited: speed, API calls (metered as above, 120 a minute per key), phone lookups ($20/mo add-on for 5,000 a month) and lead search (10,000 records a month).
- Re-checking costs nothing: confirmed results are cached for 14 days, so an overlapping list returns those rows at once.
- Duplicates and addresses we cannot check are never counted.
What happens past 100,000 checks a month
Full speed is not instant. Mailbox checks are paced so mailbox providers keep answering, and the daily capacity is shared by every customer: about 60 addresses a minute while the day's capacity lasts, about 30 a minute averaged over a day (roughly 43,200 a day). So a 100,000-row list at full speed takes about 2-3 days when it has the capacity to itself.
Past the volume, a big list moves to the paced lane: it runs after other customers' full-speed lists. When nobody else is waiting it runs at the normal pace; on the busiest days each account still gets at least 2,000 rows a day. The job card shows an estimated finish date, finished rows download as they complete, and nothing is refused or charged extra.
| Rows past the volume | Quiet queue | Busiest case |
|---|---|---|
| 50,000 | about 1-2 days | up to 25 days |
| 100,000 | about 2-3 days | up to 50 days |
| 400,000 | about 9-10 days | up to 200 days |
Need big monthly volumes at full speed? Business and Agency have bigger volumes and put their big lists ahead of the shared queue.
Unlimited email verification vs credits at 100k, 500k and 1M a month
The cheapest published route for each vendor to verify that many emails every month (a plan that covers it, or buying the covering credit pack again each month), read off each vendor's pricing page between 12 October 2026 and 5 November 2026. Every price links to its source. No accuracy test was run.
| Service | 100,000/mo | 500,000/mo | 1,000,000/mo | Checked |
|---|---|---|---|---|
| SimpleVerifier | $39Pro: all at full speed | $249Agency: all at full speedor Pro $39, 400,000 paced | $249Agency: first 750,000 at full speed, the rest pacedor Pro $39, 900,000 paced | — |
| VeriMails | $69$69/mo plan with 100,000 a month | $150$150/mo plan with 500,000 a month | $300$300/mo plan with 1,500,000 a month | 2026-11-05 |
| BillionVerify | $64$64/mo plan with 100,000 a month | $160$160/mo plan with 500,000 a month | $280$280/mo plan with 1,000,000 a month | 2026-11-05 |
| Emails Checker | $49.50Pay as you go: 100,000-credit pack at $0.49 per 1,000 | $165Pay as you go: 500,000-credit pack at $0.33 per 1,000 | $275Pay as you go: 1,000,000-credit pack at $0.28 per 1,000 | 2026-11-05 |
| Listclean | $35Pay as you go: 100,000-credit pack at $0.35 per 1,000 | $175Pay as you go: 1,000,000-credit pack at $0.17 per 1,000 | $175Pay as you go: 1,000,000-credit pack at $0.17 per 1,000 | 2026-11-04 |
| MyEmailVerifier | $89$89/mo plan with 100,000 a month | $219$219/mo plan with 500,000 a month | $299$299/mo plan with 1,000,000 a month | 2026-11-05 |
| Proofy | $75.65$75.65/mo plan with 100,000 a month | $237.15$237.15/mo plan with 500,000 a month | $364.65$364.65/mo plan with 1,000,000 a month | 2026-11-03 |
| Bulk Email Checker | $74.95Pay as you go: 100,000-credit pack at $0.75 per 1,000 | $279.95Pay as you go: 500,000-credit pack at $0.56 per 1,000 | $409.95Pay as you go: 1,000,000-credit pack at $0.41 per 1,000 | 2026-11-04 |
| MillionVerifier | $149Pay as you go: 100,000-credit pack at $1.49 per 1,000 | $299Pay as you go: 500,000-credit pack at $0.60 per 1,000 | $449Pay as you go: 1,000,000-credit pack at $0.45 per 1,000 | 2026-11-02 |
| Bouncify | $99$99/mo plan with 100,000 a month | $299$299/mo plan with 500,000 a month | $479$479/mo plan with 1,000,000 a month | 2026-11-03 |
| Verimail | $79$79/mo plan with 100,000 a month | $299$299/mo plan with 1,000,000 a month | $299$299/mo plan with 1,000,000 a month | 2026-11-05 |
| Bounceless | $99$99/mo plan with 100,000 a month | $349$349/mo plan with 500,000 a month | $499$499/mo plan with 1,000,000 a month | 2026-11-04 |
| Truelist | $90Pay as you go: 100,000-credit pack at $0.90 per 1,000 | $350Pay as you go: 500,000-credit pack at $0.70 per 1,000 | $700Pay as you go: 1,000,000-credit pack at $0.70 per 1,000 | 2026-11-02 |
| MailboxValidator | $199.95Pay as you go: 100,000-credit pack at $2.00 per 1,000 | $399.95Pay as you go: 500,000-credit pack at $0.80 per 1,000 | $699.95Pay as you go: 1,000,000-credit pack at $0.70 per 1,000 | 2026-10-12 |
| DeBounce | $124.20$124.20/mo plan with 100,000 a month | $450Pay as you go: 500,000-credit pack at $0.90 per 1,000 | $750Pay as you go: 1,000,000-credit pack at $0.75 per 1,000 | 2026-11-02 |
| NeverBounce | $159$159/mo plan with 100,000 a month | $499$499/mo plan with 500,000 a month | $999$999/mo plan with 1,000,000 a month | 2026-11-02 |
| Reoon | $116.40Pay as you go: 100,000-credit pack at $1.16 per 1,000 | $522Pay as you go: 500,000-credit pack at $1.04 per 1,000 | $972Pay as you go: 1,000,000-credit pack at $0.97 per 1,000 | 2026-11-03 |
| Captain Verify | $212.40$212.40/mo plan with 100,000 a month | $531$531/mo plan with 500,000 a month | $690.30$690.30/mo plan with 1,000,000 a month | 2026-11-04 |
| Email List Validation | $229$229/mo plan with 100,000 a month | $599$599/mo plan with 500,000 a month | $899$899/mo plan with 1,000,000 a month | 2026-10-12 |
| SafetyMails | $194$194/mo plan with 100,000 a month | $685$685/mo plan with 500,000 a month | $998$998/mo plan with 1,000,000 a month | 2026-11-05 |
| EmailVerify.io | $149$149/mo plan with 100,000 a month | $699$699/mo plan with 500,000 a month | $1,299$1,299/mo plan with 1,000,000 a month | 2026-11-05 |
| Mailfloss | $209$209/mo plan with 125,000 a month | $729$729/mo plan with 510,000 a month | $1,200Pay as you go: 1,000,000-credit pack at $1.20 per 1,000 | 2026-10-12 |
| Clearalist | $250Pay as you go: 100,000-credit pack at $2.50 per 1,000 | $750Pay as you go: 500,000-credit pack at $1.50 per 1,000 | $1,000Pay as you go: 1,000,000-credit pack at $1.00 per 1,000 | 2026-11-05 |
| BounceBan | $255$255/mo plan with 100,000 a month | $850$850/mo plan with 500,000 a month | $1,450$1,450/mo plan with 1,000,000 a month | 2026-11-03 |
| Clearout | $360$360/mo plan with 100,000 a month | $900$900/mo plan with 500,000 a month | $1,260$1,260/mo plan with 1,000,000 a month | 2026-11-03 |
| QuickEmailVerification | $320Pay as you go: 100,000-credit pack at $3.20 per 1,000 | $900Pay as you go: 500,000-credit pack at $1.80 per 1,000 | $1,350Pay as you go: 1,000,000-credit pack at $1.35 per 1,000 | 2026-11-03 |
| EmailListVerify | $168$168/mo plan with 100,000 a month | $930Pay as you go: 5 × 100,000-credit packs | $1,860Pay as you go: 10 × 100,000-credit packs | 2026-10-30 |
| Verifalia | $389Pay as you go: 100,000-credit pack at $3.89 per 1,000 | $990Pay as you go: 500,000-credit pack at $1.98 per 1,000 | $1,490Pay as you go: 1,000,000-credit pack at $1.49 per 1,000 | 2026-11-02 |
| Bouncer | $320$320/mo plan with 100,000 a month | $1,000$1,000/mo plan with 500,000 a month | $1,600$1,600/mo plan with 1,000,000 a month | 2026-11-02 |
| Xverify | $400Pay as you go: 100,000-credit pack at $4.00 per 1,000 | $1,000Pay as you go: 500,000-credit pack at $2.00 per 1,000 | $1,500Pay as you go: 1,000,000-credit pack at $1.50 per 1,000 | 2026-10-12 |
| Emailable | $357$357/mo plan with 100,000 a month | $1,147.50$1,147.50/mo plan with 500,000 a month | $1,785$1,785/mo plan with 1,000,000 a month | 2026-10-30 |
| Email Hippo | $468$468/mo plan with 100,000 a month | $1,247.90$1,247.90/mo plan with 500,000 a month | $1,871.90$1,871.90/mo plan with 1,000,000 a month | 2026-10-12 |
| Email Verifier API | $399.95Pay as you go: 100,000-credit pack at $4.00 per 1,000 | $1,499.95Pay as you go: 500,000-credit pack at $3.00 per 1,000 | $2,499.95Pay as you go: 1,000,000-credit pack at $2.50 per 1,000 | 2026-11-05 |
| MailerCheck | $500Pay as you go: 100,000-credit pack at $5.00 per 1,000 | $1,500Pay as you go: 500,000-credit pack at $3.00 per 1,000 | $2,000Pay as you go: 1,000,000-credit pack at $2.00 per 1,000 | 2026-11-03 |
| ZeroBounce | $449$449/mo plan with 100,000 a month | $1,699$1,699/mo plan with 500,000 a month | $2,499$2,499/mo plan with 1,000,000 a month | 2026-10-30 |
| Kickbox | $500Pay as you go: 100,000-credit pack at $5.00 per 1,000 | $1,800Pay as you go: 500,000-credit pack at $3.60 per 1,000 | $2,999Pay as you go: 1,000,000-credit pack at $3.00 per 1,000 | 2026-11-03 |
| Scrubby | $497$497/mo plan with 100,000 a month | $4,000Pay as you go: $8.00 per 1,000, billed per email | $8,000Pay as you go: $8.00 per 1,000, billed per email | 2026-11-03 |
| Abstract API | $199$199/mo plan with 150,000 a month | Not published | Not published | 2026-10-12 |
| Mailboxlayer | $249.99$249.99/mo plan with 250,000 a month | Not published | Not published | 2026-10-12 |
| Enrichley | $1,699$1,699/mo plan with 450,000 a month | Not published | Not published | 2026-10-12 |
| EmailValidation.io | $94.99$94.99/mo plan with 100,000 a month | Not published | Not published | 2026-10-12 |
| EmailOversight | $400$400/mo plan with 100,000 a month | Not published | Not published | 2026-11-05 |
- 100,000 a month: Listclean publishes a lower monthly price.
- 500,000 a month: VeriMails, BillionVerify, Emails Checker, Listclean, MyEmailVerifier, Proofy publish a lower monthly price.
- 1,000,000 a month: Listclean publishes a lower monthly price.
- A credit pack can still be the better buy for one clean you will not repeat. Prices change; if one is out of date, tell us on the comparison page.
How do these tools compare?
Ranked by the lowest published price to verify 1,000,000 addresses in a month (a monthly plan that covers it, otherwise a 1,000,000-credit pack). The extra column shows what happens when you go past the plan.
| # | Tool | 1,000,000 a month | Past the allowance | Free limit | Bulk limit | Price | Signup needed | Best for |
|---|---|---|---|---|---|---|---|---|
| 1 | SimpleVerifier | $99 | Keeps running in a slower lane; no extra charge | 100 free email checks, one time, with Google sign-in and no card | Fair use: lists past the full-speed volume run slower, never refused | $99/mo Business: the first 300,000 checks a month at full speed, then slower, never cut off; Pro $39 (100,000); Agency $249 (750,000) | Yes (Google sign-in) | Senders who verify every month and want a fixed bill |
| 2 | MillionVerifier | $449 | Buy more credits | 100 free credits | Limited by credits bought | $449 for 1,000,000 credits (one-time) | Yes (free account) | Very large one-off cleans |
| 3 | DeBounce | $690 | Buy more credits | 100 free credits | Limited by credits bought | $690/mo for 1,000,000 (monthly); $750 one-time | Yes (free account) | Small and medium lists cleaned once or monthly |
| 4 | Emailable | $1,785 | Buy more credits | 250 free credits | Limited by credits bought | $1,785/mo for 1,000,000 (subscription); $2,100 one-time | Yes (free account) | Buyers who want credits that never expire |
| 5 | Bouncer | $2,000 | Buy more credits | 100 free credits | Limited by credits bought | $2,000 for 1,000,000 (one-time) | Yes (free account) | Teams that also want inbox placement and blocklist tests |
| 6 | ZeroBounce | $2,499 | Unused ONE credits roll over; buy more | 100 free validations a month | Limited by credits bought | $2,499/mo ZeroBounce ONE for 1,000,000 (its calculator, read 30 Oct 2026); over 1,000,000: contact sales | Yes (free account) | Teams that want a deliverability suite in one plan |
| 7 | Kickbox | $2,999 | Buy more credits | 100 free credits | Limited by credits bought | $2,999 for 1,000,000 (one-time) | Yes (free account) | Senders who also want deliverability consulting |
| 8 | NeverBounce | Not published | Growth caps at 10,000 a month; Enterprise is custom | Free credits to test a first list (amount not stated) | Up to 10,000 a month on Growth; more priced on request | Enterprise: custom, "unlimited usage across teams"; $8 per 1,000 pay as you go | Yes (free account) | Teams that want verification synced into many marketing tools |
| 9 | Clearout | Not published | Auto top-up from $40 for 5,000 credits | 100 free credits (no expiry) | Limited by credits bought | Enterprise (10M+ volume): contact sales | Yes (free account) | Annual buyers who also want an email finder and prospecting |
Which one should you pick?
Pick SimpleVerifier if you verify or re-check lists every month and want one flat monthly price instead of credits, with catch-all addresses kept risky rather than marked valid.
Skip SimpleVerifier if you want the lowest price for one small list, where another vendor's pack can cost less (cost by list size); you need your data processed only inside the EU (our service providers process data in several countries, including the US); or your list is mostly Outlook.com, Hotmail or Live addresses, which Microsoft currently won't let us confirm, so they come back risky (why).
Pick MillionVerifier if you clean a very large list once in a while: 1,000,000 credits are $449 one-time, never expire, and there is no subscription to cancel.
Pick DeBounce if you want a low price on a one-off clean of a small or medium list, with pay-as-you-go credits that never expire.
Pick Emailable if you want 250 free credits to test with and credits that never expire.
Pick Bouncer if you also want inbox placement and blocklist tests from the same vendor (its Deliverability Kit is a separate plan).
Pick ZeroBounce if you will use what its subscription bundles (inbox placement tests, blacklist monitoring, warmup), or want a free allowance that refills every month.
Pick Kickbox if you want unknown results refunded as credits, or deliverability consulting alongside verification.
Pick NeverBounce if you want verification synced inside many marketing tools: its pricing page lists 80+ integrations.
Pick Clearout if you pay yearly and also want an email finder and prospecting on the same credit balance.
How we compared
On 27 October 2026 we read each vendor's pricing page for a flat or unlimited plan, its price at 1,000,000 verifications, and what happens when credits run out. EmailListVerify (volume pricing on request) and Hunter (monthly credit plans, largest 50,000 verifications) are left out because neither sells a flat or unlimited plan or publishes a price at this volume. We did not run an accuracy benchmark, so nothing here ranks accuracy: test a shortlist on a sample of your own list, including addresses you know are dead.
Each tool in a few lines
1. SimpleVerifier(our tool)
Best for: Senders who verify every month and want a fixed bill
- A second pass over the same list costs nothing extra
- Starter ($9, 2,500) is a capped plan for small volumes
- Watch out: One-time packs run at standard speed and cover CSV verification only (no API or finder)
- Watch out: Starter's allowance resets monthly and does not roll over, and has no API; 10,000 a month needs Pro
Checked October 27, 2026: SimpleVerifier pricing · SimpleVerifier integrations
2. MillionVerifier
Best for: Very large one-off cleans
- 1,000,000 credits are $449 and never expire
- No subscription to cancel
- Watch out: No monthly plan, so a monthly re-check is a new purchase each time
Checked October 27, 2026: MillionVerifier pricing (all packages) · MillionVerifier help: integrations
3. DeBounce
Best for: Small and medium lists cleaned once or monthly
- Pay-as-you-go credits never expire
- 100,000 credits are $135 one-time
- Watch out: Every pass over the same list is billed again
Checked October 27, 2026: DeBounce pricing · DeBounce integrations
4. Emailable
Best for: Buyers who want credits that never expire
- 250 free credits on signup
- The subscription saves 15% and can be cancelled
- Watch out: Per-credit pricing: 100,000 a month is $357 on the subscription
Checked October 27, 2026: Emailable pricing · Emailable integrations
5. Bouncer
Best for: Teams that also want inbox placement and blocklist tests
- Credits never expire
- Deliverability Kit (inbox placement, blocklist tests) from $25 a month
- Watch out: The Deliverability Kit is a separate plan from verification
Checked October 27, 2026: Bouncer pricing · Bouncer integrations
6. ZeroBounce
Best for: Teams that want a deliverability suite in one plan
- The free allowance refills every month
- ONE bundles warmup, inbox tests and blacklist monitoring
- Watch out: Pay as you go starts at $39 for 2,000 credits
Checked October 30, 2026: ZeroBounce pricing
7. Kickbox
Best for: Senders who also want deliverability consulting
- Unknown results are refunded as credits, by its pricing page
- Watch out: No subscription; every list is a per-email purchase
Checked October 27, 2026: Kickbox pricing · Kickbox integrations
8. NeverBounce
Best for: Teams that want verification synced into many marketing tools
- Its pricing page says it works with Zapier, n8n, HubSpot, Mailchimp and 80+ integrations
- Watch out: Pay-as-you-go credits expire 12 months after purchase
Checked October 27, 2026: NeverBounce pricing
9. Clearout
Best for: Annual buyers who also want an email finder and prospecting
- Unused plan credits roll over, by its pricing page
- Verification, finder and prospecting share one balance
- Watch out: The monthly-billed price for 10,000 is well above the yearly rate
Checked October 27, 2026: Clearout pricing · Clearout integrations
Common questions
- Is there truly unlimited email verification?
- Yes on SimpleVerifier Pro, Business and Agency, in the sense of no cap and never cut off: the first 100,000, 300,000 or 750,000 checks a month run at full speed, then big lists run in a paced lane.
- Is there an email verifier with no credits?
- Yes: SimpleVerifier Pro is a flat $39 a month with no credits and no per-email fees, never cut off, with the first 100,000 checks a month at full speed.
- What is flat-rate email verification?
- One fixed monthly price for email verification, whatever the volume, instead of paying per credit; on SimpleVerifier each plan has a monthly full-speed volume and nothing past it is refused.
- What happens after the first 100,000 checks on Pro?
- Big lists (2,000+ rows) keep running in a paced lane that goes after other customers' full-speed lists, at the normal pace when the queue is quiet and at least 2,000 rows a day on the busiest days, with no extra charge.
- How fast is full speed?
- About 30 addresses a minute averaged over a day, shared by every customer, so 100,000 takes about 2-3 days when it has the capacity to itself.
- Is the API unlimited too?
- No: Pro includes 10,000 API calls a month, then $1.50 per 1,000 on monthly billing (Business 100,000, Agency 300,000).
- Are phone checks or the email finder unlimited?
- No: live phone lookups are a $20 a month add-on for 5,000 lookups, and the email finder and lead search run under fair use.
- Is an email verification subscription cheaper than credits?
- For lists you verify every month or re-check, usually yes, because every pass on credits is bought again; the table above shows each vendor's published monthly price at 100k, 500k and 1M.
- When is a credit pack better than an unlimited plan?
- For a single clean you will not repeat: MillionVerifier's 1,000,000 credits are $449 one-time and never expire, with nothing to cancel.
- Why can SimpleVerifier sell a flat monthly price?
- A mailbox check costs almost nothing per address, so it prices by speed lane instead of by credit; what is limited is daily check capacity, which is why each plan has a full-speed volume.
- Is the cheapest verifier the most accurate?
- We did not run an accuracy benchmark, so nothing here ranks accuracy: test a shortlist on a sample of your own list, including addresses you know are dead.
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.
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