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MailboxValidator Free Email Checker

MailboxValidator Free Email Checker — free tier with API key

🔧 Developer ToolsHEALTHYchecked 6h ago
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.

94HOW IT'S SCORED ⓘ
Docs ↗
Status badge · for your READMEshipapis health badge: 94 · healthy
Uptime history
100%90 days
100%30 days
527P50 · ms
1138P95 · ms
operationalpartialdownno data
Response time · last 48 checks
Fastest 75 ms, slowest 833 ms, most recent 75 ms.
Live response samplecaptured by our last successful check
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 · 3HealthyFULL DOCS ↗
Monitored path responding — GET /527 mschecked 6h ago
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

Stable. No schema drift observed since monitoring began — the response shape has not changed under our checks.

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 Rate limits: Unpublished.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?

As of our last scheduled check, MailboxValidator Free Email Checker is healthy with 100% uptime over 90 days and a 527 ms median response. We re-probe it every sweep — the status badge and uptime chart above always show the latest.