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MailboxValidator Free Email Checker

MailboxValidator Free Email Checker — free tier with API key

🔧 Developer ToolsUNMONITORED
AUTH APIKEYCORS ✗AGENT ?HTTPS ✓COMMERCIAL ?

MailboxValidator Free Email Checker exposes a free-tier JSON API. Register for an API key if required; we verified a public or demo endpoint.

—HOW IT'S SCORED ⓘ
Docs ↗
Status badge · for your READMEshipapis health badge: — · unmonitored
ON PROBE SCHEDULE

We probe a documented GET and expect 2xx JSON — full uptime and health score. Open provider docs ↗

Uptime historystarts after first probe

On our probe schedule. Uptime charts appear after the first check lands.

Example responsefrom provider docs — not verified by us
GET https://api.mailboxvalidator.com/

{
  "email_address": "",
  "domain": "",
  "is_free": "",
  "is_syntax": "",
  "is_domain": "",
  "is_smtp": "",
  "is_verified": "",
  "is_server_down": ""
}
Call itcurl · fetch · python
curl "https://api.mailboxvalidator.com/"
const res = await fetch("https://api.mailboxvalidator.com/");
const data = await res.json();
console.log(data);
import requests

res = requests.get("https://api.mailboxvalidator.com/")
print(res.json())

BROWSER CALLS BLOCKED (NO CORS/HTTPS) — USE THE CURL SNIPPET

Endpoints · 3On scheduleFULL DOCS ↗
On schedule — GET / awaits first probe
GET/PROBED

MailboxValidator Free Email Checker — free tier with API key

GET/?limit=5

Paginated variant with limit parameter.

GET/v1/validation/single

The Single Validation API does validation on a single email address and returns all the validation results in either JSO

Machine-readable spec

We probe a documented GET and expect 2xx JSON — full uptime and health score. Export includes every documented route below.

Response-shape history

Not tracked yet. Shape-change history starts once this API joins our probe schedule.

MailboxValidator Free Email Checker: common questions

Is MailboxValidator Free Email Checker free to use?

Yes — MailboxValidator Free Email Checker is a free developer tools API. Free tier: Free tier — API key required. Whether the free tier allows commercial use is unclear — check the provider docs.

Does MailboxValidator Free Email Checker need an API key?

Yes — MailboxValidator Free Email Checker needs a free API key, which you pass on each request. Rate limits: Unpublished.

Can I call MailboxValidator Free Email Checker from the browser?

Not directly — MailboxValidator Free Email Checker doesn't send browser-friendly CORS headers, so call it from a server or proxy instead. Copy the curl or Python snippet on this page to get started.

Is MailboxValidator Free Email Checker up right now?

MailboxValidator Free Email Checker is catalogued but not yet on our probe schedule, so we don't publish a live status for it. Check the provider's own status page or docs for its current state.