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emailzeno vs Kickbox:
which is better for developers and API-first teams?

API-first, same no-DATA SMTP approach, EU-hosted by default — at roughly half the per-verification price.

Try free — 300 verifications See full comparison

All competitor data sourced from public pricing and documentation pages. ¹ Footnote marks denote claims verified as of 2026-05-11.

TL;DR — winner per dimension

✅ Pricing model
➖ Accuracy claim
➖ Free tier
✅ Integrations
➖ REST API
✅ Refund policy
✅ GDPR / EU hosting
➖ Support SLA

✅ emailzeno wins  ·  ⚠️ Kickbox wins  ·  ➖ Tie

Feature-by-feature: emailzeno vs Kickbox

Dimension EmailZeno Kickbox Winner
Pricing model Flat $9–$79/mo subscription Pay-per-verification credits¹ ✅
Accuracy claim 99.6 % (SMTP + MX layer) 95–99 % stated on site¹ ➖
Free tier 300 verifications, no card 100 free verifications¹ ➖
Integrations 35+ via native + Zapier 20+ native integrations¹ ✅
REST API Full REST + webhooks + bulk REST API, sandbox mode¹ ➖
Refund policy Auto-credit on hard bounces No stated refund policy¹ ✅
GDPR / EU hosting EU-hosted by default US-hosted, DPA on request¹ ✅
Support SLA Email + chat, 24 h SLA Email + developer docs¹ ➖

¹ Competitor data verified from public sources as of 2026-05-11. Pricing and features may change — check the competitor's site for the latest.

Pricing side-by-side

EmailZeno
  • Free $0 300 verifications/mo
  • Solo $9 5 000 verifications/mo
  • Growth $29 25 000 verifications/mo
  • Unlimited $39 Unlimited flat rate
  • Scale $79 100 000 verifications/mo
Start free
Kickbox
  • Pay-go $0.008/email 1 000 emails = $8¹
  • Pay-go $0.005/email 10 000 emails = $50¹
  • Pay-go $0.002/email 100 000 emails = $200¹

¹ As of 2026-05-11. Check their site for latest pricing.

When Kickbox is the better pick

Kickbox is the better pick if you need a sandbox mode for integration testing without using real credits — their sandbox environment is mature and well-documented, and it's a genuine developer productivity win. Kickbox also offers a "Sendex" quality score that gives a nuanced risk rating beyond binary valid/invalid, which can be useful if your ESP or CRM supports tiered segmentation on that score. Their brand is well-established in developer circles and their API documentation is thorough.

When emailzeno is the better pick

emailzeno costs significantly less at every volume tier. At 10 000 verifications/month, Kickbox charges ~$50; our Growth plan covers 25 000 for $29. Our Unlimited plan at $39 has no ceiling — Kickbox has no equivalent. EU data residency is native, which simplifies compliance for European senders. Our automatic credit refund policy on hard bounces is a concrete financial guarantee Kickbox doesn't currently offer.

Moving from Kickbox?

Migrating from Kickbox? Their result field maps cleanly: deliverable → keep, undeliverable → suppress, risky/unknown → review. Export your Kickbox results CSV, filter the undeliverable rows, and upload to emailzeno's Suppression Manager. For API migration: the emailzeno endpoint accepts the same email field; the response schema adds a confidence_score field alongside our status.

Import your suppression list →

Ready to try emailzeno?

300 free verifications. No credit card. Cancel any time.

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Frequently asked questions

We provide a set of reserved test addresses (e.g. <code>[email protected]</code>, <code>[email protected]</code>) that return predictable responses without consuming credits. A full isolated sandbox environment is on our roadmap for Q3 2026.

Both services probe via SMTP EHLO/MAIL FROM/RCPT TO and immediately QUIT — no DATA, no message delivery. This is the industry-standard approach for non-intrusive probing. The implementations differ in per-domain rate limiting; our engine applies per-domain concurrency caps to avoid triggering spam filters at Gmail, Yahoo, and Outlook.

Our engine enforces ≤5 concurrent SMTP connections per recipient domain (≤3 for Gmail/Yahoo/Outlook) with a 30-minute backoff when error rates exceed 30% over 60 seconds. This is more conservative than typical bulk tools, which protects your sender IP reputation across all clients on the shared infrastructure.
Free forever — no credit card

Clean lists ship faster.
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300 verifications /mo · five-minute API integration · credit refund on hard bounces. Trusted by senders who treat sender reputation like the asset it is.

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