How to Verify iCloud, Gmail & Outlook Emails via API (2026 Guide)

Email verification is essential for keeping your list clean and reducing bounce rates. In this guide, I'll show how to verify emails from major providers like Gmail, iCloud, and Outlook.

Why Email Verification Matters

• Reduces bounce rate from 20%+ to under 2%
• Protects sender reputation
• Saves money on email marketing costs

How It Works

Each email provider requires a different verification method:

• Gmail — Uses Google's account lookup API
• iCloud — Uses Apple's password reset flow with CAPTCHA solving
• Outlook/Hotmail — Uses Microsoft's GetCredentialType API
• Others — SMTP verification + MX record checks

Quick API Example

javascript
const response = await fetch(
'https://checkmail1.com/api/[email protected]',
{ headers: { 'X-API-Key': 'your-key' } }
);
const result = await response.json();
// { status: 'valid', score: 100, confidence: 'high' }

Bulk Verification

For large lists, upload a CSV file and get results back with valid/invalid/unknown status for each email.

Try it free: checkmail1.com