MailRambo vs ZeroBounce
ZeroBounce is a large email validation and deliverability suite that adds AI scoring, activity data, warmup and DMARC tools on top of verification. MailRambo is an email verification API that gives one strict yes/no per address, starting at $5 with 100 free checks every month. Here's how they compare.
Side by side
| MailRambo | ZeroBounce | |
|---|---|---|
| Free tier | 100 verifications every month, API included | 100 credits/month (business domain signup) |
| Entry price | $5/mo for 1,000, or $9 for 2,000 (never expire) | $39 for 2,000 (smallest pay-as-you-go) |
| ~10,000 verifications | $29 for 10,000 (never expire) | ZeroBounce ONE from $99/mo (10,000+ credits) |
| Credit expiry | Pack credits never expire | Roll over while subscribed; otherwise expiration rules may apply |
| Catch-all addresses | Answered as not deliverable (reason: catch_all) | Returned as 'catch-all' - you decide |
| API answer format | Strict yes/no + reason code | Status: valid, invalid, catch-all, unknown, spamtrap, abuse, do_not_mail |
| Free test / sandbox mode | Yes - free mr_test_ keys with canned answers | Check their site |
| Public OpenAPI spec | Yes - public /v1/openapi.json | Check their site |
| Domain auth data (SPF/DKIM/DMARC) | Yes - SPF, DKIM, DMARC, BIMI, PTR via ?detail=full | Check their site |
| Retry-safe batch requests | Yes - Idempotency-Key on batches | Check their site |
| Free instant check for signup forms | Yes - mode=fast: free, under 1s (syntax, typos, MX, disposable) | Check their site |
| Free repeat checks | Yes - same address within 24h is free | Check their site |
ZeroBounce details from their pricing page, checked September 2026. Prices change; confirm on their site.
Why teams choose MailRambo
- Start at $5 instead of $39. Per check, ZeroBounce's smallest pay-as-you-go pack ($39 for 2,000) costs about 4x MailRambo's Starter plan.
- One decision per address. ZeroBounce returns seven statuses, so your code has to decide what catch-all and unknown mean. MailRambo answers yes or no, with the reason.
- Build for free with test keys, and use the API on the Free plan.
When ZeroBounce is the better fit
Choose ZeroBounce if you want an all-in-one deliverability suite (warmup, inbox testing, activity data) from a single vendor and have the budget for it.
Switching from ZeroBounce
Point your code at /v1/verify and map ZeroBounce's results to a single boolean:
| ZeroBounce result | MailRambo |
|---|---|
valid | deliverable: true (mailbox_exists) |
invalid | false (mailbox_not_found) |
catch-all | false (catch_all) |
unknown | false (unverifiable) |
spamtrap | false (spamtrap) |
abuse / do_not_mail | false (role_account / disposable etc.) |
const res = await fetch("https://www.mailrambo.com/v1/verify", {
method: "POST",
headers: {
Authorization: `Bearer ${process.env.MAILRAMBO_KEY}`,
"Content-Type": "application/json",
},
body: JSON.stringify({ email }),
});
const { deliverable, reason } = await res.json();
if (!deliverable) reject(reason); // "catch_all", "disposable", "mailbox_not_found", ...Build it with a free mr_test_ key first - no credits used. API reference · OpenAPI spec
Frequently asked questions
Is MailRambo cheaper than ZeroBounce?
For most volumes, yes. MailRambo starts at $5/month for 1,000 verifications, and 10,000 costs $29 as a pack that never expires. Check ZeroBounce's pricing page for their current rates; we last checked in September 2026.
How do I migrate from ZeroBounce to MailRambo?
Swap the endpoint and map ZeroBounce's statuses to MailRambo's deliverable true/false. Most integrations take under an hour, and free test keys let you try it without spending credits.
How does MailRambo handle catch-all addresses?
They count as not deliverable, with reason catch_all. Catch-all servers accept every address during the check, so the mailbox can't be confirmed and many of those messages bounce later.
Is there a free plan?
Yes: 100 verifications every month, with full API access and free test keys.
More comparisons
MailRambo vs NeverBounce
Pricing, catch-all handling and API features side by side.
MailRambo vs Hunter
Pricing, catch-all handling and API features side by side.
MailRambo vs Kickbox
Pricing, catch-all handling and API features side by side.
MailRambo vs Emailable
Pricing, catch-all handling and API features side by side.
MailRambo vs DeBounce
Pricing, catch-all handling and API features side by side.
MailRambo vs MillionVerifier
Pricing, catch-all handling and API features side by side.
MailRambo vs Clearout
Pricing, catch-all handling and API features side by side.
Run these checks from your code
Verify addresses at signup, clean lists and read SPF/DKIM/DMARC with one API call. 100 free verifications a month, test keys that cost nothing, and the API on every plan.