mailboxlayer
Email address validation
- Authentication
- API Key
- HTTPS
- Yes
- CORS
- Unknown
- Category
- Data source
- public-apis
Overview
Mailboxlayer (an APILayer product) validates email addresses — syntax, MX/SMTP checks, disposable detection, and risk scores. Auth is a free API key — like other APILayer APIs, invalid keys return HTTP 200 with "success": false (verified).
Quick Start
Validate an email (replace YOUR_KEY):
curl "http://apilayer.net/api/check?access_key=YOUR_KEY&[email protected]"{
"success": true,
"email": "[email protected]",
"format_valid": true,
"mx_found": true,
"smtp_check": true,
"disposable": false,
"score": 0.9
}Authentication
- Register at mailboxlayer.com → free API key (emailed).
- Send it as the
access_keyquery parameter. - Invalid keys return 200 +
"success": false(verified) — check the JSON.
Rate Limits & Notes
- Free tier: 250 requests/month; paid plans scale.
- The API is served over http (https is paid on some tiers) — use https when available.
- Fields:
format_valid,mx_found,smtp_check,disposable,score(0-1 risk). - SMTP checks are the most expensive operation — they can be slow or rate-limited.
FAQ
Is Mailboxlayer free? Free tier: 250 requests/month; more is paid.
Why 200 with success:false?
APILayer convention — check the success field in the response body.
What does score mean? A 0-1 deliverability/risk score for the address.
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