Best email verifier for cold email: 11 tools compared
Quick answer: For cold email, two things matter: catch-all handling and getting results back into the sequencer. By published price for 10,000 a month (checked 27 October 2026), SimpleVerifier Growth is $19, DeBounce $23 and EmailListVerify $25. SimpleVerifier connects to Instantly and Smartlead; MillionVerifier lists a Smartlead connection. The rest work by CSV. No accuracy test was run.
By SimpleVerifier Team · Last updated · Prices and limits checked on each vendor’s own site
Which email verifier is built for cold email?
SimpleVerifier checks each mailbox over SMTP before a list goes into Instantly, Smartlead or lemlist, keeps catch-all addresses risky, and connects to Instantly and Smartlead by API key. Monthly plans: $9 for 2,500 emails, $19 for 10,000, or Pro at $29.99 with 100,000 a month at full speed, never cut off. 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); Growth $19/mo for 10,000 ($1.90 per 1,000); Pro $29.99/mo, 100,000 a month at full speed ($0.30 per 1,000 when used), then slower, never cut off. Business $99/mo, Agency $249/mo. |
| 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). No one-time credit packs. Starter and Growth allowances reset monthly and do not roll over. |
| 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 or Growth. |
| 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 are a $20/mo add-on (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. Outlook.com, Hotmail and iCloud mailboxes are not probed and come back risky. |
SimpleVerifier facts from our pricing page and product. Last updated .
How do these tools compare?
Ranked by the lowest published price to verify 10,000 addresses a month (a monthly plan where one exists, otherwise a 10,000-credit pack). The extra column shows which cold email senders each vendor lists an integration for on its own site.
| # | Tool | 10,000 a month | Instantly / Smartlead | Free limit | Bulk limit | Price | Signup needed | Best for |
|---|---|---|---|---|---|---|---|---|
| 1 | SimpleVerifier | $19 | Both: API key, tags leads, daily auto-verify on paid plans | 100 free email checks, one time, with Google sign-in and no card | CSV up to 100,000 rows; Pro runs 100,000 a month at full speed, then slower, never cut off | $19/mo for 10,000 (Growth); $9/mo for 2,500 (Starter); $29.99/mo Pro | Yes (Google sign-in) | Lists checked every month, re-checks, and campaign tools it connects to |
| 2 | DeBounce | $23 | Neither found on its site; CSV | 100 free credits | Limited by credits bought | $23/mo for 10,000 (monthly); $25 one-time | Yes (free account) | Small and medium lists cleaned once or monthly |
| 3 | EmailListVerify | $25 | Neither found on its site; CSV | 100 free credits on signup | Limited by credits bought | $25/mo for 10,000; $27 one-time | Yes (free account) | Steady lists of 5,000-10,000 a month |
| 4 | MillionVerifier | $39 | Smartlead (its help pages); Instantly not found | 100 free credits | Limited by credits bought | $39 for 10,000 credits (one-time) | Yes (free account) | Very large one-off cleans |
| 5 | NeverBounce | $49 | Neither found on its site; CSV | Free credits to test a first list (amount not stated) | Up to 10,000 a month on Growth; more priced on request | $49/mo for up to 10,000 (Growth); $8 per 1,000 pay as you go | Yes (free account) | Teams that want verification synced into many marketing tools |
| 6 | Emailable | $51 | Neither found on its site; CSV | 250 free credits | Limited by credits bought | $51/mo for 10,000 (subscription); $60 one-time | Yes (free account) | Buyers who want credits that never expire |
| 7 | Clearout | $58 | Neither found on its site; CSV | 100 free credits (no expiry) | Limited by credits bought | $58/mo for 10,000 billed monthly; $32/mo billed yearly | Yes (free account) | Annual buyers who also want an email finder and prospecting |
| 8 | Bouncer | $60 | Neither found on its site; CSV | 100 free credits | Limited by credits bought | $60 for 10,000 (one-time); its subscription price did not load for us | Yes (free account) | Teams that also want inbox placement and blocklist tests |
| 9 | Kickbox | $70 | Neither found on its site; CSV | 100 free credits | Limited by credits bought | $70 for 10,000 (one-time) | Yes (free account) | Senders who also want deliverability consulting |
| 10 | ZeroBounce | $99 | Neither found on its site; CSV | 100 free validations a month | Limited by credits bought | $99/mo for 10,000 (ZeroBounce ONE); pay as you go from $39 for 2,000 | Yes (free account) | Teams that want a deliverability suite in one plan |
| 11 | Hunter | $149 | Neither found on its site; CSV | 50 credits a month (100 verifications) | Limited by monthly credits | $149/mo (Growth: 10,000 credits = 20,000 verifications) | Yes (free account) | Outreach teams that find, verify and send in one tool |
How we compared
On 27 October 2026 we read each vendor's pricing page and looked for Instantly and Smartlead integrations on its own integrations page or help center. 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: Lists checked every month, re-checks, and campaign tools it connects to
- Connects to Instantly, Smartlead, HubSpot and Mailchimp by API key and tags each contact valid, risky or invalid
- Catch-all addresses stay risky, never valid
- Watch out: No one-time pack: every plan is a monthly subscription you cancel
- Watch out: Starter and Growth allowances reset monthly and do not roll over; no API on those two
Checked October 27, 2026: SimpleVerifier pricing · SimpleVerifier integrations
2. 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
3. EmailListVerify
Best for: Steady lists of 5,000-10,000 a month
- A 5,000-a-month plan is $16
- Pay-as-you-go credits never expire
- Watch out: The page shows euros in some regions while its structured data lists US dollars
Checked October 27, 2026: EmailListVerify pricing · EmailListVerify integrations
4. 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
5. 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
6. 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
7. 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
8. 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
9. 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
10. 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 27, 2026: ZeroBounce pricing
11. Hunter
Best for: Outreach teams that find, verify and send in one tool
- Email finder, campaigns and verification in one product
- Watch out: The $49 Starter plan covers 4,000 verifications, so 10,000 a month needs Growth
Checked October 27, 2026: Hunter pricing · Hunter integrations
Common questions
- Should I send cold email to catch-all addresses?
- Not mixed into the main campaign. A catch-all server accepts every address, so a verifier cannot confirm the mailbox. SimpleVerifier keeps them risky, never valid, and grades them; send them in a small separate batch and watch bounces.
- Which email verifier works with Instantly and Smartlead?
- SimpleVerifier connects to both by API key. On 27 October 2026 MillionVerifier listed a Smartlead connection; we found no Instantly or Smartlead integration on the other vendors' sites. Instantly and Smartlead also sell their own verifiers.
- How much does it cost to verify 10,000 cold email leads?
- By published monthly prices: SimpleVerifier Growth $19, DeBounce $23, EmailListVerify $25, NeverBounce $49, ZeroBounce ONE $99. One-time packs: DeBounce $25, MillionVerifier $39, Bouncer $60, Kickbox $70.
- What bounce rate is safe for cold email?
- Keep hard bounces well under 2% per campaign; Google's bulk-sender rules also cap spam complaints at 0.3%. See what bounce rate gets an account suspended.
- 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.
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