Best email verifier for agencies: 9 tools compared

Which email verifier is best for agencies?

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 today

One sending IP today, shared by every customer: about 13,000 mailbox checks a day in the standard lane. Bad syntax, dead domains and disposable addresses return at once; a list of 100,000 takes days, not hours, and each job shows its estimated finish time.

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.

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 October 31, 2026.

Which one should you pick?

• Pick SimpleVerifier if you verify or re-check lists every month and want one flat monthly price instead of credits, with catch-all addresses kept risky rather than marked valid.

  Skip SimpleVerifier if you want the lowest price for one small list, where another vendor's pack can cost less (cost by list size); you need your data processed only inside the EU (our service providers process data in several countries, including the US); or your list is mostly Outlook.com, Hotmail or Live addresses, which Microsoft currently won't let us confirm, so they come back risky (why).

• Pick MillionVerifier if you clean a very large list once in a while: 1,000,000 credits are $449 one-time, never expire, and there is no subscription to cancel.

• Pick DeBounce if you want a low price on a one-off clean of a small or medium list, with pay-as-you-go credits that never expire.

• Pick Emailable if you want 250 free credits to test with and credits that never expire.

• Pick Bouncer if you also want inbox placement and blocklist tests from the same vendor (its Deliverability Kit is a separate plan).

• Pick ZeroBounce if you will use what its subscription bundles (inbox placement tests, blacklist monitoring, warmup), or want a free allowance that refills every month.

• Pick Kickbox if you want unknown results refunded as credits, or deliverability consulting alongside verification.

• Pick NeverBounce if you want verification synced inside many marketing tools: its pricing page lists 80+ integrations.

• Pick Clearout if you pay yearly and also want an email finder and prospecting on the same credit balance.

How we compared

On 27 October 2026 we read each vendor's pricing page for its price at 1,000,000 verifications and for seats or client separation it lists there. A blank means the pricing page does not say, not that the feature is missing. EmailListVerify and Hunter are left out: neither publishes a price for this volume (volume pricing on request; Hunter's largest plan covers 50,000) or lists team features on its pricing page. 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. 1. SimpleVerifier(our tool)

   Best for: Agencies running client lists every month

   • Agency plan files each list under a client, with history and exports filtered by client
   • Business and Agency include a priority lane and API calls (100,000 and 300,000 a month)
   • Watch out: One-time packs run at standard speed and cover CSV verification only (no API or finder)
   • Watch out: Starter's allowance resets monthly and does not roll over, and has no API; 10,000 a month needs Pro

   Checked October 27, 2026: SimpleVerifier pricing · SimpleVerifier integrations

2. 2. 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

3. 3. 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

4. 4. 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

5. 5. 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

6. 6. 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 30, 2026: ZeroBounce pricing

7. 7. 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

8. 8. 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

9. 9. 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

Common questions

Which email verifier is best for an agency with many clients?

One where the price at your total monthly volume is predictable and teammates can share the account. SimpleVerifier Agency ($249 a month) has 15 seats and client workspaces; Business ($99) has 5 seats. Credit vendors such as MillionVerifier cost less per pass for a one-off million but are billed again on every re-check.

Do email verifiers offer white label for agencies?

Not as a white-label app. SimpleVerifier Agency includes client reports with the agency's name and logo (print, PDF or an expiring share link that carries a small "Verified with SimpleVerifier" line), but no custom domain or reseller billing. We did not find white label on the other pricing pages in this table; ask each vendor directly if you need it.

How should an agency handle risky addresses for a client?

Report them separately from valid ones and send them, if at all, in a small test batch. See the agency list verification workflow.

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.