SimpleVerifier Team · Reviewed
Unlimited email verification: what does it mean, what does it cost, and what are the limits?
On SimpleVerifier, unlimited email verification means a flat monthly price with no credits and no per-email fee, and lists are never cut off. Pro is $39 a month, and the first 100,000 a month run at full speed, then slower, never cut off. API calls, live phone lookups and speed are not unlimited.
What unlimited means here
You pay one monthly price and verify as many email addresses as you have. Nothing is metered per address, nothing expires, and a big list is never refused or cut off halfway. The limit is speed, not volume: the first 100,000 a month run at full speed, then slower, never cut off.
Mailbox checks are conversations with other companies' mail servers, so no verifier can promise an instant answer for a very large list. The fair-use line decides which lists go first, not whether they finish.
What it costs
Monthly plans, with the volume that runs at full speed on each. Pro is the plan most lists of 2,000 to 100,000 rows need.
| Plan | Price a month | Checks a month at full speed | API calls included |
|---|---|---|---|
| Pro | $39 | 100,000 | 10,000 |
| Business | $99 | 300,000 | 100,000 |
| Agency | $249 | 750,000 | 300,000 |
What a steady month costs at 100k, 500k and 1M
Flat plans do not rise with volume, so the same price covers a quiet month and a busy one.
- 100,000 checks a month: $39 on Pro (all at full speed).
- 500,000 checks a month: $249 on Agency (all at full speed).
- 1,000,000 checks a month: $249 on Agency (first 750,000 at full speed, the rest paced).
The limits, in plain words
These are the limits to know before you buy.
- Full speed: the first 100,000 checks a month on Pro. Past that, big lists (2,000 rows and up) run in a paced lane behind other customers' full-speed lists.
- 50,000 rows past the line take about 1-2 days when the queue is quiet, and up to 25 days on the busiest days (at least 2,000 rows a day).
- 100,000 rows past the line take about 2-3 days when the queue is quiet, and up to 50 days on the busiest days (at least 2,000 rows a day).
- 400,000 rows past the line take about 9-10 days when the queue is quiet, and up to 200 days on the busiest days (at least 2,000 rows a day).
- The API is not unlimited: Pro includes 10,000 calls a month, then calls are billed per 1,000.
- Live phone lookups and the email finder are not unlimited.
- Catch-all and Outlook addresses come back risky, never guessed valid. Unlimited does not change what a mail server will tell us.
When unlimited is not the right buy
For one small list, a pack can cost less than a month of a flat plan. One-time packs from $15 for 10,000 checks up to $169 for 250,000; the credits never expire and run at standard speed (CSV verification only). If you will verify every month, or re-check lists, a flat plan stops the bill growing with every pass.
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 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 .
Related questions
- How much does unlimited email verification cost?
- Pro is $39 a month ($390 a year): no credits, no per-email fee, the first 100,000 a month run at full speed, then slower, never cut off. Business is $99 a month for bigger volumes. The first 100 checks are free.
- Is unlimited email verification really unlimited?
- There is no cap and no per-email fee, and lists are never cut off. The limit is speed: the first 100,000 a month run at full speed, then slower, never cut off. That is the fair-use rule in full.
- Can I verify 100,000 emails on Pro?
- Yes. The first 100,000 checks a month run at full speed, so a list of 100,000 fits inside Pro's full-speed volume. Capacity is shared by all customers, so a very large list can still take days rather than hours; every job shows its estimated finish time.
- Is the API or phone lookup unlimited too?
- No. API calls are included monthly and then billed per 1,000, and live phone lookups and the email finder have their own limits.
Sources
- SimpleVerifier pricing and limits
- Unlimited email verification: flat price, no credits, never cut off (SimpleVerifier comparison with vendors' published plans)
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.
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