B2B Email Finder & Bulk DNS/MX/SMTP Email Verifier API

Publisher: Keene Digital Studio
Pricing: $1.00 per 1,000 emails ($0.001 per verified or discovered email) · $0.00 Actor start fee
Architecture: Pure concurrent network protocol utility combining RFC 5322 syntax & IDN normalization, disposable & free webmail detection, role-account classification, live DNS MX / SPF / DMARC resolution, mail provider fingerprinting, non-intrusive SMTP probe, and B2B corporate email permutation & domain contact discovery.

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Why Switch to This Actor? (Transparent Pricing & Reliability Comparison)

Incumbent email verifiers and B2B email finders on the Apify Store either suffer from high failure rates (17.6% failure rate on clearpath/email-finder-api while charging $8.00/1k patterns tested + $5.00/1k start fee) or charge predatory Free-tier rates ($100.00 per 1,000 emails — $0.10 per single email! on michael.g/email-verifier-validator).

Our Actor is a zero-proxy, zero-API-key protocol engine priced at a flat $1.00 per 1,000 results ($0.001/item) with a $0.00 start fee across all tiers.

Feature / Metric	Keene Digital Studio b2b-email-finder-verifier	Incumbent #1 clearpath/email-finder-api	Incumbent #2 michael.g/email-verifier-validator
Price per 1,000 Results (Free Tier)	$1.00 / 1k ($0.001/item)	$8.00 / 1k patterns tested	$100.00 / 1k ($0.10/email on Free tier)
Actor Start Fee	$0.00	$5.00 / 1k starts ($0.005/start)	$0.00
Your Savings	Baseline	87.5% Cheaper + $0 Start Fee	99% Cheaper on Free Tier
30-Day Success Rate	>=98%+ Verified	82.4% (17.6% failure rate)	99.5%
Live DNS MX + SPF + DMARC Posture	Included Free	Basic MX only	Basic MX + SMTP
Mail Server Provider Fingerprinting	13+ Enterprise Providers	No	No
B2B Lead Permutation + Domain Discovery	Included in Same Actor	Charges per pattern tested	Verification only

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7-Layer Verification & B2B Discovery Pipeline

1. RFC 5322 Syntax & IDN/Punycode Normalization: Validates local-part and domain structure, detects +tag plus-addressing, and suggests fixes for common domain typos (gmial.com → gmail.com).
2. Disposable & Temp-Mail Blocklist: Instantly flags 200+ disposable email providers (mailinator.com, guerrillamail.com, 10minutemail.com, yopmail.com, tempmail.org, sharklasers.com, maildrop.cc, etc.).
3. Free Webmail vs. Corporate B2B Classification: Distinguishes consumer webmail (gmail.com, yahoo.com, outlook.com, icloud.com, proton.me) from true B2B corporate domains (isB2bCorporateDomain: true).
4. Role-Account Detection: Flags shared functional inboxes (support@, sales@, info@, admin@, billing@, security@, careers@, press@, legal@, hr@, etc.).
5. Live DNS MX, SPF (v=spf1), and DMARC (_dmarc.) Resolution: Queries live DNS records with multi-provider DNS-over-HTTPS (dns.google & cloudflare-dns.com) + dnspython fallback in <30ms, returning sorted mxRecords, spfRecord, dmarcRecord, and dmarcPolicy (none, quarantine, reject).
6. Mail Server Provider Fingerprinting: Automatically fingerprints Google Workspace, Microsoft 365, Cloudflare Email Routing / Security, Proofpoint, Mimecast, Amazon SES, ProtonMail, Fastmail, Zoho Mail, Barracuda Email Security, Mailgun, SendGrid, Postmark, or Custom / Self-Hosted MX.
7. B2B Lead Email Permutation & Domain Contact Discovery: Given firstName, lastName, and domain, generates standard corporate permutations (first.last@, first@, flast@, first_last@, f.last@, firstl@, last.first@), checks public company pages (/.well-known/security.txt, homepage) for published @domain contacts, and returns the highest-confidence verified B2B email.

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Input Example

{
  "mode": "both",
  "emails": [
    "support@stripe.com",
    "press@openai.com",
    "temp@mailinator.com",
    "invalid-user@nonexistent-domain-99999.xyz"
  ],
  "leads": [
    {
      "firstName": "Patrick",
      "lastName": "Collison",
      "domain": "stripe.com"
    }
  ],
  "scrapeDomainContacts": true,
  "enableSmtpProbe": false,
  "maxConcurrency": 10
}

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Output Example

[
  {
    "email": "support@stripe.com",
    "normalizedEmail": "support@stripe.com",
    "recordType": "verification",
    "deliverabilityStatus": "deliverable",
    "confidenceScore": 92,
    "isValidSyntax": true,
    "localPart": "support",
    "domain": "stripe.com",
    "isDisposable": false,
    "isFreeWebmail": false,
    "isRoleAccount": true,
    "isB2bCorporateDomain": true,
    "isPlusAddressed": false,
    "typoSuggestion": null,
    "hasMx": true,
    "mxRecords": [
      { "priority": 10, "exchange": "aspmx.l.google.com" },
      { "priority": 20, "exchange": "alt1.aspmx.l.google.com" }
    ],
    "mailProvider": "Google Workspace",
    "hasSpf": true,
    "spfRecord": "v=spf1 include:_spf.google.com include:spf.stripe.com ~all",
    "hasDmarc": true,
    "dmarcRecord": "v=DMARC1; p=reject; rua=mailto:dmarc@stripe.com",
    "dmarcPolicy": "reject",
    "smtpCheck": {
      "attempted": false,
      "port25Reachable": false,
      "smtpCode": null,
      "smtpMessage": "SMTP probe skipped (DNS/MX/SPF/DMARC fast verification mode)"
    },
    "firstName": null,
    "lastName": null,
    "selectedPattern": null,
    "candidatePermutations": [],
    "discoveredDomainEmails": [],
    "statusReason": "valid_mx_spf_dmarc_verified",
    "extractedVia": "doh_google_dns",
    "elapsedMs": 42
  }
]

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Local CLI Usage

$python3 -m src.main --input '{"mode": "both", "emails": ["support@stripe.com"], "leads": [{"firstName": "Patrick", "lastName": "Collison", "domain": "stripe.com"}]}'

Built and maintained by Keene Digital Studio.