Mailbeam vs ZeroBounce
An honest comparison of features, pricing, and performance — updated August 2026.
TL;DR — Which should you choose?
Choose Mailbeam if:
- You need EU/GDPR-compliant processing with EU data residency
- You're integrating real-time verification into a signup flow, where latency is felt
- You want transparent per-verification pricing with no credits or multipliers
Choose ZeroBounce if:
- You have large existing lists to clean in bulk and are US-based
- Your team already uses ZeroBounce integrations (Mailchimp, HubSpot, etc.)
Why developers look for ZeroBounce alternatives
ZeroBounce is a US-based email verification service focused on bulk list cleaning for email marketers. Founded in 2013 in Florida, it serves primarily US companies.. These are the pain points teams cite most often when they move away:
- 1ZeroBounce processes your users' email addresses on US servers, creating GDPR compliance risks for EU companies
- 2The credit system makes billing unpredictable — some operations cost multiple credits per verification
- 3Real-time API latency averages 300ms+, noticeably slowing down signup flows
- 4Credit multipliers make the real cost per verification hard to predict
- 5The dashboard and UX feel dated compared to modern developer tools
- 6Catch-all detection returns a flag without any scoring or explanation
What Mailbeam does differently
Mailbeam is a developer-first EU email verification API. This is what changes for teams leaving ZeroBounce:
- EU data residency with a signed DPA included — no GDPR compliance gymnastics
- Real-time API purpose-built for signup flows, with a batch endpoint when you do need to clean a list
- Transparent per-verification pricing — no credits, no multipliers, no surprises
- A 0–100 quality score with an explainable reason field on every verification
- REST API today; official SDKs for 6 languages on the roadmap
- A modern developer experience with descriptive error codes
Feature-by-feature comparison
| Feature | Mailbeam | ZeroBounce |
|---|---|---|
| Pricing | ||
| Free tier | 1,000/mo | Partial |
| Free tier size | 1,000/month | 100 credits/month |
| Pricing model | Per-verification | Credits |
| Credits required | No | Yes |
| Monthly subscription | Yes | Yes |
| Annual discount | 20% | yes (varies) |
| Price at 50K/month | €49 | ~$159 |
| Price at 1M/month | €499 | ~$1,999 |
| Verification checks | ||
| Syntax validation | Yes | Yes |
| MX records | Yes | Yes |
| SMTP probing | Yes | Yes |
| Disposable detection | 50,000+ domains | Yes |
| Role-based detection | Yes | Yes |
| Catch-all detection | Yes | Partial |
| Quality score (0–100) | 0–100 | No |
| Explainable reason field | Yes | No |
| Typo suggestions | Yes | No |
| API & platform | ||
| Real-time single-address API | Yes | Partial |
| P95 response time | not published yet | ~300ms |
| Batch/bulk verification | Yes | Yes |
| Webhooks | Yes | Yes |
| Official SDKs | Roadmap | partial (3rd-party) |
| OpenAPI specification | Roadmap | No |
| Test / sandbox mode | Yes | No |
| Compliance & security | ||
| EU data residency | Frankfurt (EU) | No |
| GDPR compliant (native) | Yes | Partial |
| DPA included | Yes | yes (on request) |
| No US data transfer | Yes | No |
| Server location | Frankfurt, EU | Florida, US |
| Developer experience | ||
| Modern dashboard | Yes | Partial |
| Documentation quality | Excellent | Good |
| TypeScript support | Yes | No |
| Error messages | Descriptive + reason code | Generic |
| Support | ||
| Free plan support | Community forum | |
| Email support | yes (Starter+) | Yes |
| Priority support | yes (Growth+) | yes (paid) |
| Uptime SLA | Roadmap | 99.9%+ |
Roadmap means we are building it and it is not available yet — not that it is missing from the plan.
Pricing comparison at every volume
| Monthly volume | Mailbeam | ZeroBounce | Saving |
|---|---|---|---|
| 1K / month | €0(Free) | ~$18 | 100% less |
| 10K / month | €19(Starter) | ~$79 | 76% less |
| 50K / month | €49(Growth) | ~$159 | 69% less |
| 200K / month | €149(Pro) | ~$499 | 70% less |
| 1M / month | €499(Scale) | ~$1,999 | 75% less |
ZeroBounce prices are approximate based on public information as of August 2026. Actual prices may vary.
Feature analysis
Real-time API performance
Mailbeam winsMailbeam is built specifically for real-time signup verification: cached and DNS-only lookups resolve in about 80ms from EU regions, and a full SMTP probe stays under a second. ZeroBounce was designed for bulk list cleaning first; its real-time API is a secondary product with reported latencies of 200–400ms. We publish our measured numbers rather than a marketing figure — see docs/accuracy.md.
GDPR and EU compliance
Mailbeam winsMailbeam stores and processes all email addresses on servers in Frankfurt, Germany. Zero data leaves the EU. ZeroBounce is headquartered in Florida and processes data on US servers. For European SaaS companies, sending user-submitted email addresses to a US third-party processor creates GDPR compliance obligations that Mailbeam eliminates entirely. A signed DPA is available on all Mailbeam plans; ZeroBounce provides one on request.
Catch-all scoring you can read
Mailbeam winsCatch-all domains (those that accept all incoming mail) are one of the hardest problems in email verification. ZeroBounce flags them as 'Catch-All' and leaves you to decide. Mailbeam probes the domain with a random address in the same connection: if that is accepted too, the acceptance of the real address proves nothing, so we downgrade the verdict to catch_all_unverifiable and cap the score rather than reporting a pass we cannot back. You get a 0–100 score and a machine-readable reason to set your own threshold on.
Pricing model
Mailbeam winsZeroBounce sells credits in bundles. Credits don't map 1:1 to verifications — some operations cost multiple credits. This makes your bill hard to predict. Mailbeam charges one unit per verification, every time, with no multipliers or bundle expiry. At 50K verifications per month, ZeroBounce costs approximately $159 versus Mailbeam's €49 — a 69% saving with cleaner billing.
Developer experience
Mailbeam winsMailbeam is a single POST with a JSON body, documented with copyable examples in five languages; official SDKs for Node.js, Python, PHP, Ruby and Go are on the roadmap and not published yet. ZeroBounce offers no official SDKs either; developers rely on third-party community libraries of varying quality. Where Mailbeam differs today is the response: machine-readable reason codes so your application can respond to 'disposable domain' differently from 'we could not find out', instead of a single 'invalid email'.
Bulk verification
ZeroBounce winsZeroBounce has been doing bulk email list cleaning since 2013. Its dashboard integrates directly with Mailchimp, HubSpot, ActiveCampaign, and 20+ ESPs, and its bulk interface is mature and battle-tested. If your primary use case is cleaning large existing lists from within a marketing tool — not building a developer API integration — ZeroBounce's ecosystem may be a better fit.
Switching from ZeroBounce to Mailbeam
Most migrations take under an hour. Here's the key code change:
// Before — ZeroBounce
// ZeroBounce (old)
const res = await fetch(
`https://api.zerobounce.net/v2/validate?api_key=${apiKey}&email=${email}`
);
const { status } = await res.json();
if (status !== "Valid") return 422;
// After — Mailbeam
// Mailbeam (new)
// No SDK yet — the 12-line wrapper from /docs/quickstart.
import { verifyEmail } from "@/lib/mailbeam";
const { valid, score, reason } = await verifyEmail(email);
if (!valid || score < 60) return 422;Read the full migration guide: Migrating from ZeroBounce →
“We switched from ZeroBounce because we needed real GDPR compliance for our EU users, not just a checkbox. Mailbeam's Frankfurt hosting and DPA made the compliance conversation easy.”
Frequently asked questions
Is Mailbeam as accurate as ZeroBounce?
We do not claim benchmark wins we have not published. Our measured accuracy against a fixed corpus lives in docs/accuracy.md and is regenerated on every change. Where Mailbeam differs by design is what it does when it cannot tell: a catch-all domain, a greylisted server or a blocked probe come back as unknown with a reason, never as a confident verdict.
Can I import my ZeroBounce credits to Mailbeam?
No — credit systems are not transferable between services. However, Mailbeam's Free plan gives you 1,000 verifications per month at no cost, so you can test Mailbeam before your ZeroBounce credits run out.
Does Mailbeam integrate with Mailchimp and HubSpot like ZeroBounce does?
Mailbeam is an API-first product. Native integrations with Mailchimp and HubSpot are on the roadmap. Today you use Mailbeam via its REST API, from any workflow that can make an HTTP request.
How long does it take to migrate from ZeroBounce to Mailbeam?
Most integrations take 30–60 minutes. You replace the ZeroBounce API call with a POST to Mailbeam, update the status check from 'Valid' string to a boolean `valid` field plus optional score threshold. See the full migration guide.
Is ZeroBounce GDPR compliant?
ZeroBounce is a US company that stores data on US servers. To use ZeroBounce legally under GDPR for EU user data, you need to sign a DPA with them and ensure your legal basis for the data transfer is valid (Standard Contractual Clauses). Mailbeam processes all data within the EU and provides a DPA automatically, eliminating this complexity.
What happens to my existing ZeroBounce account?
Nothing changes to your ZeroBounce account — you can keep using it in parallel while you test Mailbeam. Mailbeam's free tier lets you verify 1,000 emails per month without a credit card.
Start verifying emails — for free
1,000 free verifications per month. No credit card required. Switch from ZeroBounce in under an hour.