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

{
  "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

{
  "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.