The new standard in verified
email deliverability.

Maximise your email deliverability and sender reputation by removing invalid emails, hard bounces, and spam traps before you hit send.

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Native provider coverage
  • Microsoft
  • Google
  • iCloud
  • Yahoo
  • Proton
  • QQ Mail
  • NetEase
& every other business domain via SMTP
99.99%
Verification accuracy
Zero catch-alls
No guesswork, no false positives
Pay-as-you-go

A simple, honest rate card.

Slide to the volume you send each month, see the price instantly. No subscriptions, no seat fees, no surprises.

volume
10,000
Verifications
You pay
$10
$1.00 per 1,000
Get 10,000 Verifications · $10
Pay once. No subscription. Credits never expire.
At 10,000 verifications, Postelist is
Postelist
$10
our price
ZeroBounce
$129
13×cheaper
NeverBounce
$50
5×cheaper
EmailListVerify
$30
3×cheaper
MillionVerifier
$39
3.9×cheaper
Cheaper. And more accurate.
Accurate now
Every verdict reflects the mailbox today, not a stale cache from last quarter.
Every major inbox
Gmail, Outlook, Yahoo, Proton, iCloud, and custom domains.
QQ & NetEase
The only validator that accurately verifies Chinese providers.
No lock-in
Public pricing. No subscription. Credits never expire.
Speed

Under a second. Every address.

Dedicated infrastructure, warmed pools, and every provider’s quirks already accounted for. Results return in well under a second, every time.

408ms
Typical verdict
Dedicated infra
Never shared, never throttled
99.9%
Uptime, always-warm API

Wire it into the tools you already run.

Every verdict flows out the moment it lands. Invalids suppressed, deliverable contacts tagged, sending lists kept quietly clean. Eight destinations, zero duct tape.

  • Webhook
    POST every verdict to any signed URL.
    HMAC
  • SendGrid
    Sync invalids straight to suppression.
    API key
  • Klaviyo
    Suppress invalids from flows and campaigns.
    Private key
  • ActiveCampaign
    Tag contacts by deliverability verdict.
    API key
  • Customer.io
    Keep the people file free of bounces.
    Track API
  • Zapier
    Route verdicts into 7,000+ apps.
    REST hook
  • Mailchimp
    Archive and clean your audience automatically.
    OAuth
  • HubSpot
    Stamp contacts with verification state.
    OAuth
Not on the list? POST anywhere with the webhook destination, or wire your own adapter through the API.
Live checkAt the signup form

Catch invalids before they reach your database.

Drop one HTTPS call into your signup form, CRM, or checkout. The verdict lands in under a second — so a mistyped address never gets saved, a disposable never enters your welcome flow, and a typo’d support email never disappears into the void.

Get an API keyRead the reference →
  • 01
    Real-time at the form

    Call POST /api/v1/validate on blur or submit. The verdict returns fast enough to reject an invalid before the user leaves the field.

  • 02
    Decisive verdicts

    Every response returns a single classification — deliverable or invalid. No catch-alls, nothing mid-grade for your frontend to interpret.

  • 03
    Safe to block on

    Hard 20s timeout, three-strike retries, and scoped keys rate-limited to 10/sec burst. Wire it in front of your database without worrying about tail latency.