Is MillionVerifier Accurate? Cheap Credits, and What You Should Check

Cheap and accurate are two separate questions

People ask "is MillionVerifier accurate?" mostly because the price looks too good. On 6 November 2026 its packs were:

Credits	Price	Per 1,000
10,000	$39	$3.90
25,000	$59	$2.36
50,000	$89	$1.78
100,000	$149	$1.49
500,000	$299	$0.60
1,000,000	$449	$0.45
5,000,000	$1,599	$0.32

Credits never expire, and new accounts get 100 free credits with no card. Compare vendors side by side in the email verification pricing index.

An SMTP check costs a verifier very little per address once the infrastructure exists. The expensive parts are the servers, the IP reputation needed to get answers from big mail providers, and support. A vendor that sells huge volumes can price low without cutting the check itself. So the price alone tells you nothing either way. Your own sample does.

What the site claims, read carefully

MillionVerifier's homepage makes several claims worth separating:

• "99%+ accuracy" and "Independent tests rank us #1." These are the vendor's statements. The page doesn't say which tests, on which lists. We know of no independent audit behind any verifier's accuracy figure, and we publish none of our own.
• "Risky Email Refund: Full refund on any email we can't verify with certainty." This is a billing promise. It tells you that uncertain rows won't cost you; it doesn't make them certain.
• "Catch-All Included: Advanced catch-all verification at no extra cost." This is the claim that matters most for B2B lists.

The catch-all question

A catch-all server accepts every address at its domain, real or made up. Ask it about [email protected] and [email protected] and you get the same yes. No verifier can turn that yes into a confirmation by asking again.

When a tool says it "verifies" catch-alls, it is combining other evidence: whether the name pattern fits the domain, whether the domain has bounced before, sometimes a test message. That can be useful. It is still a likelihood. If a tool moves catch-all rows into "good" and you send them as if they were confirmed, a bounce spike on a cold campaign is the usual result.

So before you buy, decide:

1. Will you send catch-all rows at all?
2. If yes, as a separate, smaller batch at the end of a sequence, with a stop rule if bounces pass 2%?

See should you send to catch-all emails and catch-all email verifiers compared.

Other limits that apply to every verifier

• Blocking servers. Some providers and security gateways refuse verification probes. Those rows come back unknown or risky, and a later bounce can still happen on send.
• Time. A list verified in March is not verified in June. People change jobs; mailboxes close. Re-check old lists.
• Your own sending. A clean list still bounces if your domain has no SPF/DKIM or your inbox is new. That is not the verifier's fault. Check with the cold email domain checker.

How to test MillionVerifier on your own list

This takes about half an hour and costs nothing but the free credits:

1. Sample 500 rows at random from the list you'll send, with the email list sampler.
2. Run the sample through MillionVerifier and through one other verifier.
3. Compare row by row in the verifier comparison tool. Note how many catch-all rows each tool called good.
4. Send only to rows both call valid, from a warmed inbox. Count hard bounces after 72 hours with the bounce rate calculator.
5. If you plan to send catch-alls, send 50 of them separately and count again. That number, not a headline percentage, is the accuracy figure that matters for your list.

Reading the result file without fooling yourself

Whatever tool you use, the result file has three kinds of rows, and each needs a different decision:

• Rows the server confirmed or rejected. Act on them: send the good, suppress the bad. This is where cheap and expensive tools agree.
• Rows labelled good on a catch-all domain. Look for a column that says catch-all or accept-all next to the status. If a row is "good" and catch-all, the verdict came from something other than the server. Move those rows into their own batch.
• Rows refunded as risky or unknown. Free is nice, but these are still unconfirmed. Re-run unknowns after a day; drop risky rows from cold sends.

Keeping those three apart is what makes a cheap verifier safe to use.

When MillionVerifier makes sense

• You clean one very large list (500,000+) once and want the lowest price per address.
• You want credits that never expire, to use over months.
• You're comfortable reviewing catch-all rows yourself rather than trusting a single label.

Where SimpleVerifier fits

SimpleVerifier makes the opposite call on catch-alls: they are always reported risky, never valid, and graded higher, medium or lower likelihood with the reason shown (how grading works). You decide whether to send them, with the evidence in front of you. Every other row gets a live SMTP mailbox check.

It is priced for repeat cleaning rather than one huge pack:

• Pro, $39 a month: Unlimited email verification.*
• Starter, $9 a month: 2,500 emails a month.
• Free: 100 checks with a Google sign-in.

*Fair use: the first 100,000 checks a month at full speed, then slower, never cut off.

If you clean 100,000 addresses once, MillionVerifier's $149 pack is cheaper than several months of anything. If you re-check 50,000 to 100,000 a month, a flat plan usually costs less over a year. Pro also includes phone format checks, an email finder, an API and an MCP server. See pricing, or try your sample on the verify page.

More reading: is MillionVerifier legit, MillionVerifier alternatives, Hunter vs MillionVerifier.