Stop bounces before they happen. Kluno uses Microsoft 365 API, Google Workspace GXLU, SMTP probing, spam trap detection, and 8 more layers to tell you exactly which emails will land.
Most tools stop at SMTP. Kluno runs all 12 layers in under a second — in parallel — so you get the most accurate result possible.
One API call. Full results. No configuration, no third-party keys, no setup overhead.
Sign up free and grab your API key from the dashboard. 100 verifications per month, no credit card.
Send a GET request with the email and your key. Our 12-layer engine runs in parallel and responds in under a second.
Get a clear status verdict: valid, invalid, or unknown — with a full breakdown of every signal.
No setup fees, no hidden costs. Pay only for what you verify.
One endpoint. One response. All the data you need to make a decision. Works with any language or framework.
{
"email": "john@company.com",
"status": "valid",
"method": "microsoft365",
"mx_provider": "Microsoft 365",
"free_provider": false,
"disposable": false,
"role_account": false,
"catch_all": false,
"typo_suggestion": null,
"response_time_ms": 2341
}
Join teams that verify emails before they send. Start with 100 free verifications — no credit card, no setup.