Frequently asked questions

A tool for checking whether an email address is real and deliverable, and for finding someone's email address from their name and company domain. Single checks, bulk CSV processing, email finder, and API — all on the same daily credits.

Every account gets 20 credits at the start of each day, no card required. They don't roll over, but they never expire as a benefit — you get a fresh 20 every day for as long as you use the product.

Each actionable result (valid / invalid / role / disposable / catch-all) uses one credit. Unknown and greylisted results are free.

Microsoft's mail servers use enumeration protection, which means a generic SMTP probe can't reliably tell a real Yahoo mailbox from a fake one. Most verifiers either flag the whole domain catch-all or guess valid for everything. We run provider-specific checks instead.

No. The math is impossible: some mail servers genuinely don't tell you whether a specific mailbox exists. The best you can do is correctly categorise results — valid, invalid, risky — and never make up answers for the rest. That's what we do.

CSV or TXT, up to 1M rows per job, with an email column you can name or let us auto-detect.

Roughly 1-3 seconds per email on average. A 10,000-row list finishes in under an hour. Jobs run in the background and you'll see live progress in the dashboard.

Yes — 60 requests/minute for the free tier, scaling up with paid plans. The dashboard shows your current limit.

Yes, cancel from your account settings anytime — you'll keep paid-plan access until the end of the current billing period, then drop back to the free daily credits.

Yes, 14-day refund window if SF Email Verifier doesn't work for you. PAYG credits are non-refundable once used, but unused balances are.

Bulk verification jobs and their results auto-delete after 7 days. We don't sell or share the lists you upload.

No. We only open a one-line SMTP handshake to confirm the mailbox accepts mail — we never send actual messages. The mailbox owner won't see anything in their inbox.