Best email verification tools, compared
Six email verification services, compared on what they charge and what they include. Prices are read from each vendor's own pricing page (6 November 2026).
Disclosure: we make MailSure, one of the six. So the picks below only credit MailSure where the published numbers show it, and every other service gets its own honest "where it is the better choice" page.
Best email verifier for…
Lowest price at 10,000 and 100,000 emails
MailSure
$20 for 10,000 and $100 for 100,000, the lowest of the six on their published pay-as-you-go prices. (We make MailSure, so check the table below yourself.)
Deliverability tools bundled with verification
Its pricing page lists inbox placement tests, blacklist and DMARC monitoring, warm-up and an email finder in the same account.
Deep CRM and marketing-platform integrations
Lists 80+ integrations, with automatic CRM sync on its Growth plan, and sits inside ZoomInfo for enterprise buyers.
Very large lists (about 500,000 emails and up)
Lists $299 for 500,000 verifications, below MailSure's $320 at that size, and offers a money-back guarantee on risky emails.
Biggest free allowance at sign-up
250 free credits to start, plus inbox reporting tools alongside verification.
A free allowance that renews every month
MailSure and ZeroBounce
Both give 100 free verifications every month, and MailSure needs no card.
Credits that never expire
MailSure, Bouncer, MillionVerifier, Emailable
NeverBounce credits expire 12 months after purchase, and ZeroBounce credits only never expire on its ONE subscription.
What each one costs
One-off credits in US dollars. Where a vendor does not sell that volume on its own, the table shows its smallest purchase.
| Pay as you go | 1,000 emails | 10,000 emails | 100,000 emails | Per 1,000 at 100,000 |
|---|---|---|---|---|
| MailSure | $4 | $20 | $100 | $1 |
| ZeroBounce | min. 2,000: $39 | $129 | $649 | $6.49 |
| NeverBounce | $8 | $50 | $400 | $4 |
| Bouncer | $8 | $60 | $400 | $4 |
| MillionVerifier | min. 10,000: $39 | $39 | $149 | $1.49 |
| Emailable | min. 5,000: $38 | $60 | $420 | $4.20 |
See the full comparison with free allowances, expiry and unknown-result policies →
The six services in short
MailSure
A focused verifier: single check, CSV upload, REST API, WordPress plugin and an MCP server for AI assistants. 100 free verifications a month, packs that never expire, unknown results never billed. It does not include inbox-placement or monitoring tools.
ZeroBounce
Choose ZeroBounce if you want email verification bundled with deliverability monitoring and warm-up tools in one subscription. Never expire with a ZeroBounce ONE subscription; otherwise “expiration rules may apply”. Unknown results are free.
NeverBounce
Choose NeverBounce if you need deep CRM and marketing-platform integrations and an enterprise contract. Credits expire 12 months after purchase. Not stated on the pricing page.
Bouncer
Choose Bouncer if you also want Bouncer’s deliverability toolkit alongside verification. Credits never expire. Unknown results and duplicates are never charged.
MillionVerifier
Choose MillionVerifier if you verify around 500,000 emails or more at once, where MillionVerifier’s listed $299 for 500,000 is below our $320. Credits never expire. A refund policy for risky emails.
Emailable
Choose Emailable if you want a larger free allowance at sign-up and the inbox reporting tools. Credits never expire. Credits spent on unknown results and duplicates are returned.
How to choose
- Work out your volume. Under 10,000 addresses a month, one-off packs beat subscriptions; the price gap between vendors grows quickly with volume.
- Check what happens to unknown results. Some addresses cannot be confirmed either way. Being billed for them raises your real cost per usable result.
- Check expiry. Credits that expire in 12 months are wasted if your list work is occasional.
- Decide whether you need the extras. Inbox-placement tests and monitoring are worth paying for if you use them, and a distraction if you only need to clean a list.
- Try before you buy. Run a few hundred real addresses through the free allowance and compare what comes back.
New to the topic? Read what email verification is, how to clean your email list and how to read verification results.
Frequently asked questions
- What is the best email verification service?
- It depends on what you need. For the lowest price per verification on one-off lists, MailSure is the cheapest of the six on the published prices. For bundled deliverability tools, ZeroBounce. For deep CRM integrations, NeverBounce. For very large lists, MillionVerifier. The table and picks above show the reasoning.
- Is there a free email verification tool?
- Yes. MailSure gives 100 free verifications every month with no card, and its free checker, MX, SPF, DKIM and DMARC tools need no account at all. ZeroBounce also offers 100 a month; Emailable gives 250 credits at sign-up.
- How accurate are email verifiers?
- No vendor can be 100% accurate, because some mail servers (large providers, catch-all domains) will not confirm whether a mailbox exists. Good services return an honest "unknown" for those instead of guessing. Check whether you are billed for unknown results: MailSure, Bouncer and ZeroBounce do not bill them, and Emailable returns the credits.
- Do I need a subscription to verify emails?
- No. All six sell one-off credit packs. Subscriptions help if you verify every month; for occasional list cleaning, packs are usually cheaper.
- How were these prices checked?
- Each figure was read from the vendor's own pricing page in a real browser on 6 November 2026 and is listed with its source on the pricing comparison page. Vendors change prices, so check before you buy.
Page canonical: https://mailsure.co/best-email-verification-tools. Prices last read 6 November 2026.