Catch dead inboxes, disposables, and disabled accounts before they cost you.
Instant, accurate checks. Supports free mode and full API keys.
Paste or upload a list and hit validate. Results are fully dynamic and exportable.
Queries Gmail, Microsoft, and general providers directly. Not just syntax or DNS.
Parallel workers. Up to 50 emails in seconds. Real progress and instant CSV export.
100 free checks/day. Unlock full power (Gmail/Microsoft specific) with a sonjj.com key.
The Next.js frontend is a beautiful client for the exact same FastAPI backend that powers the original CLI tool.
{
"email": "user@company.com",
"api_key": "sonjj_xxx", // optional
"mode": "auto"
}