TL;DR
- Price: MailExchange is 28% cheaper at 5K, 30% at 10K, 40% at 100K and 43% at 1M.
- Terms: both refund unknown results and both sell pay-as-you-go credits. MailExchange adds 250 free credits (Kickbox gives 100), free duplicates, credits that never expire, and an optional monthly plan at 15% off.
- Pick Kickbox if you need its SOC 2 compliance or its native HubSpot, Mailchimp or Salesforce integrations today. Pick MailExchange if you clean lead lists by CSV and want the lower bill.
Pricing (pay as you go)
Kickbox has no subscription. You buy a credit pack, and one credit verifies one address. MailExchange works the same way, so this is a like-for-like comparison.
| Emails | Kickbox | MailExchange | You save |
|---|---|---|---|
| 5,000 | $40 | $29 | $11 (28%) |
| 10,000 | $70 | $49 | $21 (30%) |
| 100,000 | $500 | $299 | $201 (40%) |
| 1,000,000 | $2,999 | $1,699 | $1,300 (43%) |
Kickbox prices from kickbox.com/pricing, checked 2026-10-17, without promotional codes. Kickbox cut its prices in mid-2026 (10K went from $80 to $70 and 100K from $800 to $500, per PricingSaaS), and the table uses the new prices.
Per email, that's $0.008 at Kickbox against $0.0058 at MailExchange for a 5,000 list, and $0.005 against $0.0030 at 100,000. The gap grows with volume. If you verify every month, MailExchange's monthly plan takes another 15% off. Kickbox doesn't offer one.
Features and terms
| Kickbox | MailExchange | |
|---|---|---|
| Free credits | 100 | 250 |
| Unknowns refunded | Yes | Yes |
| Duplicates free | Not stated | Yes |
| Credits expire | Not stated | Never |
| Monthly plan | No, pay as you go only | Optional, 15% off |
| Catch-all, role and disposable | Not checked | Each labelled separately under "risky" |
| API | Yes | Early access |
| Native integrations (HubSpot, Mailchimp, Klaviyo, Salesforce, Zapier) | Yes | CSV and API today, connectors on the roadmap |
| Cold-email workflows | Not featured | Instantly, Smartlead and Apollo guides |
Kickbox terms and integrations from its pricing and integrations pages, checked 2026-10-17.
Where Kickbox is the better fit
Kickbox says over 150,000 senders use it, and it's a solid product. It is SOC 2 and GDPR compliant, which matters if your security team reviews every vendor that touches a customer list. And if you want verification running inside HubSpot or Salesforce without touching a CSV, Kickbox's native integrations do that today. MailExchange's connectors are still on the roadmap.
Where MailExchange is the better fit
Most cold emailers export leads from Apollo or a scraper, clean them, and import them into Instantly or Smartlead. That's a CSV job, and for a CSV job you're paying for the verification, nothing else. MailExchange runs the same six checks (syntax, DNS and MX, risk lists, an SMTP mailbox check, a catch-all test and a verdict) without sending an email, and charges less at every volume.
Results come back as deliverable, risky, undeliverable or unknown. Risky is split into catch-all, role and disposable, so you can decide what to do with catch-alls instead of getting one lumped-together "risky" flag. Our catch-all guide explains how to handle them in a cold campaign.
Switching from Kickbox
There's nothing to migrate. Export your list as CSV, upload it to MailExchange, and filter on the result column the way you do now. Use up any Kickbox credits you already paid for first. Start with the 250 free credits to compare results on a sample of your own list.
Common questions
Is Kickbox more accurate? No verifier gets a definite answer from every mail server, and accuracy claims are hard to compare. The fair test is your own data: run the same 250-address sample through both and compare how many come back deliverable, risky and unknown. Our free email checker handles single addresses.
Does MailExchange send an email to check an address? MailExchange never sends a message. It talks to the mail server and stops before any email content is sent.
What about catch-all domains? A catch-all server accepts every address, so no verifier can confirm the mailbox. MailExchange labels these separately so you can choose to skip them, send to a small test batch, or send only to your best-fit leads.