Smart Email Finder & Verifier Find professional email addresses using intelligent pattern discovery. Input name + domain, get email addresses with confidence scoring. ## Features - Intelligent Pattern Generation: Tests up to 14 common corporate email formats (first.last@, flast@, first@, etc.) - SMTP Verification: Verifies if the email mailbox exists (when supported by mail server) - MX Record Validation: Confirms the domain has valid mail servers - Catch-All Detection: Identifies domains that accept all emails to avoid false positives - Pattern Fallback: Returns best-guess email with lower confidence when SMTP blocked - Confidence Scoring: 0-100 score based on verification depth - Bulk CSV Support: Process hundreds of contacts at once - Disposable Email Detection: Flags temporary/throwaway email domains - Cloud-Optimized: 30-second timeout per contact, handles blocked SMTP gracefully ## How It Works 1. Generate Patterns: Creates 14 common email formats from the provided name 2. Check Domain: Verifies the domain has MX (mail exchange) records 3. Detect Catch-All: Tests if domain accepts all addresses (reduces false positives) 4. Verify Emails: Tests each pattern via SMTP RCPT TO command 5. Stop on Success: Returns first verified email to save credits ## Input json { "contacts": [ { "first_name": "Tim", "last_name": "Cook", "domain": "apple.com" }, { "first_name": "Satya", "last_name": "Nadella", "domain": "microsoft.com" } ], "maxPatternsToTest": 8, "verificationLevel": "smtp", "detectCatchAll": true, "timeout": 5 } ### Input Fields | Field | Type | Description | |-------|------|-------------| | contacts | array | List of contacts with first_name, last_name, domain | | csvInput | string | Alternative: paste CSV data | | maxPatternsToTest | integer | Max patterns to test per contact (1-14, default: 8) | | verificationLevel | string | "format", "mx", or "smtp" (default: smtp) | | detectCatchAll | boolean | Test for catch-all domains (default: true) | | timeout | integer | SMTP connection timeout in seconds (default: 5) | ### CSV Format first_name,last_name,domain Tim,Cook,apple.com Satya,Nadella,microsoft.com ## Output json { "email": "tcook@apple.com", "first_name": "Tim", "last_name": "Cook", "domain": "apple.com", "is_valid_format": true, "has_mx_records": true, "is_verified": true, "is_catch_all": false, "confidence_score": 90, "verification_method": "smtp", "smtp_code": 250, "smtp_message": "2.1.5 tcook@apple.com Ok", "mx_host": "mx-in.g.apple.com", "patterns_tried": 3, "verification_time_ms": 2635, "error": null } ### Output Fields | Field | Description | |-------|-------------| | email | Found email address (or best guess) | | is_verified | True if SMTP verification confirmed mailbox exists | | is_catch_all | True if domain accepts all addresses | | confidence_score | 0-100 confidence rating | | patterns_tried | Number of patterns tested before success | | smtp_code | SMTP response code (250 = success) | ## Confidence Score Guide | Score | Meaning | Verification Method | |-------|---------|---------------------| | 90 | SMTP verified, mailbox exists | smtp | | 60 | SMTP verified, but catch-all domain | smtp | | 55 | Pattern not rejected by SMTP | smtp_partial | | 45 | Pattern-based guess (SMTP blocked) | pattern_fallback | | 50 | MX records confirmed | mx | | 35 | Format only, no verification | format | | 0 | Invalid domain or no MX records | - | Note: Most large companies (Apple, Microsoft, Google, etc.) block SMTP verification from datacenter IPs. For these domains, you'll get pattern-based results with 45% confidence. The pattern first.last@domain.com is correct for 70%+ of corporate emails. ## Verification Levels - format: Fastest. Only validates email format. Low accuracy. - mx: Medium. Checks if domain has mail servers. Better accuracy. - smtp: Most thorough. Verifies mailbox exists. Best accuracy. ## Limitations - SMTP Blocking: Many large companies (Apple, Google, Microsoft, etc.) block SMTP verification from datacenter IPs. Pattern-based fallback is used in these cases. - Catch-All Domains: Some domains accept all addresses, making verification unreliable - Rate Limiting: High volume may trigger mail server rate limits - 30-Second Limit: Each contact has a 30-second max processing time ## Expected Results by Domain Type | Domain Type | Example | Expected Result | |-------------|---------|-----------------| | Small/Medium Business | startupxyz.com | Often SMTP verified (90% confidence) | | Enterprise (relaxed security) | ibm.com | Sometimes SMTP verified | | Big Tech | google.com, apple.com | Pattern fallback (45% confidence) | | Catch-All Domains | Various | Verified but lower confidence (60%) | ## Use Cases - Sales Outreach: Find decision-maker emails for cold outreach - Recruiting: Locate candidate contact information - Lead Generation: Enrich lead lists with verified emails - Data Enrichment: Add email addresses to CRM records - Research: Find contact info for journalists, experts, etc. ## Pricing $8 per 1,000 verified emails found. You only pay for emails that are successfully verified. Unverified results are free. ## Support For questions or issues, contact the developer or open an issue in the repository.