API

Email Validator API — Validate & Verify Email Addresses

August 22, 2026  ·  4 min read

An email validator does more than check format. A real validator confirms the mailbox exists, isn't disposable, and can actually receive email. The CheckMail1 Email Validator API does all of this in one call.

Email Validation vs Email Verification

FeatureValidation OnlyCheckMail1 Validator
Syntax checkYesYes
MX record checkSomeYes
Mailbox existsNoYes
Disposable detectionNoYes
Catch-all detectionNoYes
Gmail / iCloud supportNoYes

API Response

{{
  "email": "user@gmail.com",
  "valid": true,
  "reason": "deliverable",
  "provider": "gmail",
  "disposable": false,
  "catchAll": false,
  "syntax": true,
  "mxFound": true
}}

Integration Examples

# Python
import requests
r = requests.get(
    "https://checkmail1.com/api/verify",
    params={{"email": "user@gmail.com"}},
    headers={{"Authorization": "Bearer YOUR_KEY"}}
)
print(r.json())

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