Real-time email verification · no emails sent

Email validation that stops bounces before they happen

Zero Jump checks syntax, typos, DNS mail servers and 121,000+ disposable domains in seconds — so every campaign lands in real inboxes and your sender reputation stays clean.

  • 500 free verifications every month
  • No credit card required
Zero Jump — Live check

Try it now — free

Instant syntax, disposable and DNS checks. Sign up for full verification.

Example results
  • jordan@acme-corp.com
    Mailbox confirmed · score 99    VALID
  • info@retailer.co
    Catch-all domain · score 68    RISKY
  • temp123@mailinator.com
    Throwaway inbox · score 10    DISPOSABLE
  • sam@gmial.com
    Did you mean gmail.com?    INVALID
121k+Disposable domains detected
5Checks on every address
0Emails sent to your contacts
LiveResults streamed as they finish
Why validate

Bad addresses cost more than a bounce

Every invalid address you send to chips away at the reputation your email provider uses to decide whether you reach the inbox.

Protect your sender reputation

High bounce rates get senders throttled or blocked. Remove invalid and risky addresses before mailbox providers notice.

Stop paying for dead contacts

Most email platforms bill by list size. Cleaning out undeliverable and throwaway addresses cuts that cost directly.

Trust your numbers

Open and click rates mean more when they're measured against real people. Clean data makes every metric honest.

Email validation

Catch bad addresses before you send

Each address runs through a layered pipeline, ending with a live conversation with the recipient's mail server that stops before any message is sent.

  • RFC 5322 syntax and typo detection
  • DNS MX lookup with A-record fallback
  • Role-based and free-provider flags
Start validating free
  • Syntax check ✓ Passed
  • Disposable database ✓ Clean
  • DNS / MX records ✓ Found
jordan@acme-corp.comVALID · 99
Bulk list cleaning

Clean an entire list in one upload

Drop in a CSV or TXT export from any CRM or email platform. We find every address, remove duplicates and stream results back live.

  • CSV, TXT and pasted lists
  • Automatic extraction and de-duplication (free)
  • Export valid-only or full reports as CSV or JSON
Clean my list
newsletter_subscribers.csvVerifying in real time…
812Valid
96Risky
74Invalid
18Disposable
Developer API

Validate at the point of sign-up

Stop bad addresses from ever entering your database. Every account includes an API key for real-time checks in forms, CRMs and data pipelines.

  • Simple JSON REST endpoints
  • Streaming endpoint for large lists
  • 0–100 deliverability score with detailed flags
Read the API docs
# Verify a single address
curl -X POST https://YOUR_DOMAIN/api/verify-single \
  -H "Authorization: Bearer zj_live_…" \
  -H "Content-Type: application/json" \
  -d '{"email":"jordan@acme-corp.com"}'

# Response
{
  "status": "VALID",
  "score": 99,
  "reason": "Mailbox verified",
  "flags": { "smtp": true, "isCatchAll": false,
             "isDisposable": false, "isRole": false }
}
Every check included

One credit, five layers of verification

All plans include the full pipeline. No add-ons, no hidden tiers.

Syntax validation

Rejects malformed addresses, illegal characters and overlong parts instantly.

DNS & MX lookup

Confirms the domain exists and can receive mail.

Disposable detection

Flags throwaway inboxes from 121,000+ temporary email domains.

Role & free-mail flags

Tags shared inboxes like info@ and free providers like Gmail.

Typo suggestions

Catches misspellings like gmial.com and suggests the fix.

How it works

Clear results you can act on

Upload or paste your list, watch results stream in, then export the addresses that are safe to send.

VALID

Domain and mailbox confirmed. Safe to send.

RISKY

Catch-all, greylisted or role-based. Send with care.

INVALID

Bad syntax, dead domain or rejected mailbox. Remove it.

DISPOSABLE

Temporary inbox that will disappear. Don't count it as a lead.

Built for

Teams that depend on reaching the inbox

Email marketers

Clean newsletter and campaign lists before every big send.

Sales teams

Verify prospect lists so outreach reaches real decision-makers.

SaaS & developers

Block fake and disposable sign-ups with the API.

Agencies

Hand clients clean data and protect the sending domains you manage.

Pricing

Start free. Upgrade when you need more.

One credit verifies one email. Credits reset on the first of every month.

Free

$0 / month

Try Zero Jump and clean small lists.

  • 500 verifications / month
  • Up to 1,000 emails per batch
  • Syntax, typo, disposable & DNS checks
  • CSV / JSON export & API access
Sign up free
Most popular

Pro

Contact us

For marketers and teams sending every week.

  • 25,000 verifications / month
  • Up to 25,000 emails per batch
  • Everything in Free
  • Priority support
Contact us

Business

Custom

For platforms verifying at sign-up or at scale.

  • 250,000+ verifications / month
  • Up to 50,000 emails per batch
  • Everything in Pro
  • Custom credit limits
Talk to sales

Need more credits or a custom plan? Get in touch and we'll set up your account.

FAQ

Frequently asked questions

Do you send emails to the addresses I verify?

No. Zero Jump checks the address format, the domain and its mail servers. Nothing is ever sent, so your contacts never see anything.

Do you store my email lists?

No. Uploaded files are parsed in memory and results are streamed straight back to your browser. We only keep your account details and how many credits you've used.

How do I upgrade to Pro or Business?

Call or email us with your expected monthly volume. Once we've agreed on a plan, we upgrade your existing account — no need to sign up again.

What counts as a credit?

One verified address uses one credit, whatever its result. Extracting emails from files and removing duplicates is free.

Clean your list before your next send

Create a free account in seconds. No credit card required.

Sign up freeContact sales