Block bot signups & invalid emails
with 99.85% accuracy.
Stop webmail bots, burner domains, and machine salts in 0.3ms. Calibrated scoring so legitimate customers are never locked out.
curl -X POST https://api.emailscore.io/v1/check \
-H "Content-Type: application/json" \
-d '{"email": "[email protected]"}'Score, Don't Blindly Block
Legacy tools give a blunt binary pass/fail that locks out legitimate buyers whenever an SMTP probe times out. EmailScore produces a calibrated 0–100 confidence score with a soft CHALLENGE tier.
Instant Human Onboarding
Recognized human names, legitimate corporate domains, and verified webmail mailboxes with healthy DNS. Pass them through instantly without friction or CAPTCHAs.
Soft Verification (Zero Lost Users)
Ambiguous patterns, subtle subaddressing, or domain typos. Require an email confirmation link or SMS OTP rather than dropping paying customers on the floor.
Automated Bot & Burner Drop
Machine-generated PRNG usernames, disposable 10-minute mail, dead domains (NXDOMAIN), and parking redirects. Block signups before fake accounts pollute your CRM.
Why 50,000-Domain Blocklists Fail Modern Abuse
Attackers don't just use 10minutemail anymore. They write automated bots on legitimate webmail providers and register fresh zero-day domains daily.
Webmail Bot Scripts (`*@gmail.com`)
Attackers generate random accounts on Gmail ([email protected]). Legacy tools see gmail.com and whitelist it immediately. EmailScore checks mailbox Shannon entropy ($H > 3.8$) and Markov bigrams to catch 99.11% of webmail bots.
Zero-Day Burner Domains ($0.99)
Fresh domains (svc-drop-812.xyz) registered hours ago are missing from static blocklists. Our in-memory DomainLedger computes registration age in nanoseconds and runs lexical DGA scoring to catch zero-day throwaway domains.
Multi-Accounting & Trial Churn
Bad actors abuse plus-addressing ([email protected]) and Gmail dot-stuffing ([email protected]) to repeatedly exhaust free tiers and API quotas. EmailScore strips salts and fingerprints identities.
Stop Fake Signups in 0.3ms.
Not 3 Seconds.
Slow email validation freezes your registration button, causing customer drop-off. Legacy APIs send synchronous SMTP handshakes (RCPT TO) taking 1.5 to 4 seconds, frequently triggering mail server throttling.
EmailScore is written in pure compiled Rust with embedded lexical corpora. It scores character randomness, bigram likelihood, and domain health entirely in RAM in 300 microseconds.
100% Stateless. We Never Store Emails. Ever.
Many email verification vendors build shadow identity graphs out of your customer data. EmailScore evaluates the string in volatile RAM for 300 microseconds, returns the score, and flushes the buffer.
Want to see the 100,000-email benchmark results?
Explore the exact empirical confusion matrix, category-by-category accuracy rates, and speed comparisons against legacy providers.