Verify Every Email. Reach Real People.
SF Email Verifier removes invalid, risky, and catch-all emails — and resolves the Gmail and Yahoo addresses others give up on — so you boost deliverability and reduce bounces.
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Trusted by 1000+ businesses worldwide
“Incredible accuracy and speed.”
“The best email verification tool we've used.”
“Improved our deliverability dramatically.”
Four checks, one credit, an answer you can trust.
Syntax & MX check
Confirms the address is well-formed and that the domain has a working mail server before spending a credit.
SMTP handshake
Connects to the real mail server and asks whether the specific mailbox accepts mail — the same step most checkers stop at.
Provider-specific resolution
For Gmail and Yahoo / Microsoft domains, runs deeper checks instead of defaulting to a generic catch-all label.
Disposable & role detection
Flags throwaway domains and generic addresses like info@ or support@ so you can decide how to treat them.
Gmail and Yahoo break standard email checkers.
Microsoft's mail servers use enumeration protection, and Gmail Workspace domains behave similarly. A plain SMTP check can't tell a real inbox from a fake one on those domains — so most tools either rubber-stamp every address as valid, or give up and flag the entire domain catch-all.
Mark the entire Yahoo domain “catch-all” — even your real contacts get skipped.
Runs deeper, provider-specific checks so real Gmail and Yahoo mailboxes come back valid — and fakes come back invalid.
Built to be accurate where it's hard.
The numbers that matter when you're protecting your sender reputation.
On a public 50k labeled set — on par with ZeroBounce and NeverBounce, ahead on Gmail/Yahoo.
Resolve the catch-all ambiguity that makes most tools rubber-stamp or skip real mailboxes.
Unknown and greylisted results never cost a credit — ambiguity is on us, not you.
Single checks in under a second; bulk lists stream in the background at scale.
Verify what you have. Find what you don't.
Check one address in real time: syntax, MX records, SMTP handshake, disposable and role-based detection.
Upload a CSV and clean thousands of addresses in the background. Unknown results are always free.
Enter a full name and a company domain to surface and verify the most likely real address.
Already have an address? Find the name and company behind it before you reach out.
Call the same engine that powers the dashboard directly from your signup form or outreach tool.
Provider-specific checks resolve catch-all ambiguity instead of giving up on it.
Fast where it counts. Thorough where it matters.
Common providers fly through. Tricky domains get the deeper checks they need — so you're never stuck with a pile of “unknown” results.
Popular domain lists
Gmail, Yahoo, Google Workspace and friends — streamed in parallel at full speed.
Mixed or complex lists
Less common and catch-all-protected domains get a thorough pass, so the verdict is real.
Throughput depends on the domains in your list — big providers rate-limit verification at their end.
One engine, every outreach workflow.
Marketers
Clean your list before every send so bounces stay low and your domain keeps landing in the inbox.
- Bulk CSV cleaning
- Lower bounce rate
- Protect sender reputation
Developers
Validate addresses at signup with a single API call. JSON in, a clear status out — no guesswork.
- REST API on every plan
- Verify at signup
- Webhooks on completion
Agencies & sales
Find the right address by name and domain, verify it, then reach out with confidence.
- Email finder + reverse lookup
- Per-client lists
- Predictable credit pricing
Verification for all your favorite platforms.
Connect the verification API to the marketing, CRM, and outreach tools you already use — verify a list in bulk or clean addresses in real time as visitors submit them.
REST API, signed webhooks, and CSV import work with website builders, CRMs, and email platforms — Zapier, HubSpot, Salesforce, Mailchimp, Klaviyo and more.
Your lists are yours. Full stop.
We never sell, share, or train on the data you upload.
Encrypted at rest
Uploaded lists are encrypted on disk and in transit over TLS.
GDPR + CCPA
Built to comply with EU and California data-protection rules.
Auto-deleted in 7 days
Bulk jobs and their files are purged automatically after a week.
No data resale
We never sell, share, or train models on your contacts.
See how we stack up before you commit.
Honest, feature-level comparisons — including where the other tool is genuinely a better fit.
Teams who care about deliverability.
“We cut our bounce rate from 9% to under 1% in a week. The Gmail and Yahoo results are the ones I actually trust now.”
“Dropped the API into our signup form in an afternoon. Fake addresses just stopped getting through.”
“Unknown results being free is the honest touch. We only pay for answers we can act on — pricing finally makes sense.”
Quick answers
Is it really free?
Yes — 20 verification credits every day, forever. No card, no trial clock. Unknown results never cost a credit.
How accurate is it on Gmail and Yahoo?
We run provider-specific checks for Gmail/Workspace and Yahoo/Microsoft 365 instead of defaulting to a generic catch-all label, so real mailboxes come back valid and fakes come back invalid.
Can I verify a whole list at once?
Upload a CSV (up to 1M rows). Jobs run in the background and download as a clean list. Files auto-delete after 7 days.
Is there an API?
Yes, on every plan — including the free tier. Call the same engine from your signup form, CRM, or outreach tool.
Start verifying for free, right now.
20 credits every day, forever. No credit card, no trial clock.