MillionVerifier review (2026): pricing, accuracy, alternatives

What MillionVerifier is

MillionVerifier is a bulk email verification service founded and run by deliverability consultant Tamás Szabó. You upload a list, connect an email platform or call its API, and it returns each address as good, bad or risky, with catch-all detection included. It sells credits rather than subscriptions, and its whole positioning is price: it claims the lowest prices in the category, backed by a money-back guarantee on anything it cannot verify with certainty.

The homepage claims 99%+ accuracy, a 4.6 out of 5 rating from more than 70,000 businesses, and that independent tests rank it first. Those are MillionVerifier’s own numbers.

Pricing explained

Credits are bought once and never expire. The published packs run from $39 for 10,000 emails to $8,499 for 50 million, and the per-email price falls steeply with volume: $0.0039 at 10,000, $0.00178 at 50,000, $0.00149 at 100,000, $0.00044 at one million and $0.00016 at 50 million.

Two rules make the effective price lower than the sticker. You are charged only for emails returned as good or bad, so risky and catch-all results, which can be 5 to 15 percent of a B2B list, cost nothing. And every five million credits bought earns one million free, with past purchases counted. There is also an auto top-up option so a running verification never stalls for lack of credits.

For a typical cold email operation, a 25,000-contact list costs $59 to clean, or about $0.24 per hundred contacts. That is a rounding error next to the cost of the inboxes you protect by doing it.

Setup and integrations

Everything is self-serve. Lists go in as CSV, TXT or XLSX, and results come back in minutes for lists of a few thousand. The one-click integrations cover the sales stack cold emailers use: Smartlead, Reply, Snov.io, Klenty, Salesflare and AutoKlose, plus HubSpot, Pipedrive, Zoho CRM and the usual newsletter platforms, 40 in total. The REST API handles real-time checks at signup forms, and EverClean is an add-on that re-verifies new contacts inside Mailchimp, HubSpot or ActiveCampaign every day.

Instantly is not on the list. If you send with Instantly, the workflow is export, verify, import.

Accuracy and what it means for deliverability

A verifier’s job is to keep your bounce rate low, because Google and Microsoft treat a high bounce rate as a sign of a bought or scraped list and will throttle or suspend new mailboxes for it. MillionVerifier’s claims of 99%+ accuracy and catch-all detection are the right features for that job, and the refund on risky results means you are not paying to be told “unknown”. We have not benchmarked its accuracy ourselves; the claims are theirs.

Who it is for, and who should look elsewhere

Anyone running cold email should be verifying every list, and at these prices the volume you send is almost irrelevant: a solo founder cleaning 10,000 contacts and an agency cleaning a million a month both fit. The exceptions are teams that need a native Instantly connection, or enterprise buyers who need seats, SSO and a contract, none of which the pricing page describes. ZeroBounce costs more per address but bundles warmup seeds, placement tests and monitoring into its $99-a-month subscription.

Using MillionVerifier with PureMail

PureMail inboxes are real Google Workspace and Microsoft 365 accounts, and their reputation is only as good as the lists sent through them. The routine that keeps them healthy: verify the list in MillionVerifier before the first send, delete bad results, keep risky results out of the first campaign on a new inbox, and re-verify any list older than two months. Then load the clean list into your sequencer and stay under the daily limits your warmup schedule allows. If your sequencer is Smartlead, the integration pushes the cleaned list straight in; otherwise use the CSV export.