Mailsurity vs ZeroBounce
ZeroBounce ONE is a nine-tool email-verification bundle. Mailsurity is a specialist: one API that answers a single question in real time (is this signup email disposable, temporary, or fake) and nothing else. If you're looking for a lighter, cheaper ZeroBounce alternative for that one question, here's the honest breakdown so you can pick the right tool for what you actually need.
Pricing
ZeroBounce charges per verification, or bundles nine tools into ZeroBounce ONE for a flat monthly fee. Mailsurity is a monthly credit subscription with a free tier to start. Figures below are Mailsurity's live current prices, not estimates.
Mailsurity
Disposable & temporary email detection, specialized.
Free tier
500 free credits, no card required.
Paid plans
Starting at $5/mo, disposable detection only. Full plan breakdown in the grid below.
ZeroBounce
Full email-verification & deliverability suite.
Free tier
A genuine $0 tier below ZeroBounce ONE, with a limited starting credit allotment across its bundled tools. See zerobounce.net for the current exact limits.
ZeroBounce ONE
From $99/mo for a minimum of 10,000 credits, shared across nine bundled tools: email validation, AI-based scoring, Email Finder, inbox-placement testing, blacklist monitoring, and more.
Starter
$5 / month
5,000 checks / month
≈ $1.00 per 1,000 checks*
Growth
$19 / month
25,000 checks / month
≈ $0.76 per 1,000 checks*
Scale
$59 / month
100,000 checks / month
≈ $0.59 per 1,000 checks*
* Cost-per-1,000 assumes the full monthly credit allotment gets used. Unused Mailsurity credits don't roll over, so the effective rate is higher below full utilization.
Prices shown are Mailsurity's current live plans (see /pricing for the full breakdown, including annual billing). ZeroBounce figures are verified as of July 2026. Confirm current rates on zerobounce.net before making a purchasing decision, since vendor pricing can change.
What each product actually covers
Disposable & temporary email detection
Mailsurity: Core product, always-on
ZeroBounce: One feature among nine
Real-time AI fallback for brand-new domains
Mailsurity: For a brand-new domain it hasn’t seen before, an AI model makes the call in real time
ZeroBounce: Not documented as a dedicated capability
Typical latency
Mailsurity: <100ms p99 on the real-time API
ZeroBounce: Not published
Full email verification (syntax, SMTP, catch-all)
Mailsurity: Not the focus
ZeroBounce: Core product
AI lead scoring & Email Finder
Mailsurity: Not offered
ZeroBounce: Bundled in ZeroBounce ONE
Deliverability tools (inbox placement, blacklist monitor)
Mailsurity: Not offered
ZeroBounce: Bundled in ZeroBounce ONE
Integration
Mailsurity: One POST endpoint, works with a plain fetch call, no SDK required
ZeroBounce: Multiple tools/dashboards across the suite
The “no SDK required” row above, in full: this is the entire integration, a single authenticated POST with plain fetch. You don't need a client library.
curl -X POST https://www.mailsurity.com/api/check-email \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Content-Type: application/json" \
-d '{"email": "user@mailinator.com"}'Full request/response schema, error codes, and examples in seven more languages: see the API reference.
Why a static disposable-domain list misses new domains
ZeroBounce doesn’t publish the mechanics of its disposable-email check, so this is an inference from how most list-based email-verification products work, not a confirmed fact about ZeroBounce specifically: most work by matching against a known-domain list. That catches everything already on the list, but a brand-new throwaway domain has to be discovered and added before any list-based check can flag it.
Mailsurity layers MX-cluster reputation and an AI fallback on top of its own 220k+ domain list: many throwaway services reuse the same handful of mail servers, so a brand-new domain pointing at a known throwaway host is suspect immediately, and a gray-zone domain no list has seen yet still gets a real-time verdict from an AI classifier. See the full 5-layer detection cascade for how each layer works.
Which one should you pick?
Pick ZeroBounce if…
You need a broad email-marketing toolkit (full mailbox verification, AI lead scoring, Email Finder, inbox-placement testing) and disposable-email detection is just one box on a longer list.
Pick Mailsurity if…
Your problem is fake or disposable signups (free-trial abuse, inflated newsletter lists, fake course enrollments) and you want one real-time endpoint where an AI model steps in for brand-new domains it hasn't seen before, plus a free tier you can start on before touching a credit card.
It doesn't have to be either/or. Adding Mailsurity next to an existing ZeroBounce setup isn't a migration, there's no account or list to move. You add one POST call at your signup endpoint and keep ZeroBounce for the batch verification and deliverability work it already does.
FAQ
Is Mailsurity a cheaper alternative to ZeroBounce?
Often, yes, depending on what you're buying. ZeroBounce ONE starts at $99/mo for a minimum of 10,000 credits shared across nine bundled tools (about $9.90 per 1,000 credits). Mailsurity starts free (500 credits, no card required), and its cheapest paid plan, Starter, is $5/mo for 5,000 checks (about $1.00 per 1,000 checks), because it only does one job, disposable-email detection, not a full verification suite. If you only need that one job, it's a meaningfully cheaper alternative; if you need the other eight tools in the bundle, it isn't a substitute for them.
Does Mailsurity do full email verification like ZeroBounce (syntax, SMTP, catch-all)?
No, and we don’t pretend to. Mailsurity is a specialist: it answers one question, quickly and cheaply, whether an email is disposable, temporary, or fake. ZeroBounce is a broader deliverability suite; if you need full mailbox verification, lead enrichment, or inbox-placement testing, it’s the better fit for that scope.
Can I use Mailsurity alongside ZeroBounce?
Yes. Some teams run Mailsurity at signup time (real-time, sub-100ms) to reject disposable addresses before they ever hit a list, and use a full verification suite separately for periodic list hygiene. The two aren’t mutually exclusive.
Does ZeroBounce catch brand-new disposable domains the way Mailsurity does?
Not confirmed either way in our sources. ZeroBounce doesn’t publish the mechanics of its disposable-email check, so this is an inference from how most list-based email-verification products work, not a confirmed fact about ZeroBounce specifically: most work from a known-domain list, so a domain typically isn’t flagged until it’s been added. What we can say with confidence is what Mailsurity does. It layers MX-cluster reputation and an AI fallback on top of its own list, so a gray-zone domain no static list has seen yet can still get flagged on its first request.
Is Mailsurity a good ZeroBounce alternative for disposable-email detection specifically?
If disposable/temporary email detection is the actual problem you have, generally yes: it's the one thing Mailsurity is built around (220k+ tracked domains, 99.4% accuracy, <100ms p99), whereas for ZeroBounce the same capability is one tool among the nine bundled into ZeroBounce ONE. If you also need full mailbox verification, lead enrichment, or inbox-placement testing, ZeroBounce ONE covers ground Mailsurity deliberately doesn't try to.
See how many of your signups are already disposable
Paste a list of your signup emails or domains and get a free, no-signup breakdown before you commit to either platform. The part before the @ never leaves your browser.