Skill

email-finder

Discovers email addresses for a domain via web scraping of contact pages, WHOIS lookups, pattern guessing from names, and APIs like Hunter.io or Apollo.io when keys available.

automation

developer-tools

npx claudepluginhub shipshitdev/skills

Tool Access

This skill uses the workspace's default tool permissions.

Preview

Discover email addresses associated with a domain using a hybrid approach: free methods first (web scraping, pattern guessing, WHOIS lookup), then APIs (Hunter.io, Apollo.io, etc.) when keys are available.

Supporting Assets

plugin.jsonreferences/full-guide.md

SKILL.md

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Stats

Stars21

Forks2

Last CommitApr 21, 2026

Used By2 plugins

Actions

View Source View Plugin View on GitHub View README

Email Finder

Overview

When to Use

Scan a domain to find associated emails
Find contact emails for a company
Replace email hunter functionality
Find email patterns for a domain
Verify email addresses
Enrich contact data with discovered emails

Project Context Discovery

Before finding emails:

Check for existing email discovery tools
Review available API keys (Hunter.io, Apollo.io)
Check compliance/privacy requirements
Look for project-specific [project]-email-finder skill

Methodology

Free Methods (Primary)

Web Scraping - Scan /contact, /about, /team pages for emails
WHOIS Lookup - Query domain registration data
Pattern Guessing - Generate patterns from names found on site:
- firstname.lastname@domain.com
- firstnamelastname@domain.com
- firstname@domain.com
- f.lastname@domain.com

API Methods (If Keys Available)

API	Env Variable	Purpose
Hunter.io	`HUNTER_API_KEY`	Domain search + verification
Apollo.io	`APOLLO_API_KEY`	Contact discovery
Snov.io	`SNOV_CLIENT_ID/SECRET`	Email finder
Clearbit	`CLEARBIT_API_KEY`	Company enrichment

Email Result Interface

interface EmailResult {
  email: string;
  source: 'web-scraping' | 'whois' | 'pattern-guessing' | 'hunter' | 'apollo';
  confidence?: number;
  firstName?: string;
  lastName?: string;
  position?: string;
  verified?: boolean;
}

Best Practices

Rate limiting: Delay between requests (1s recommended)
Respect robots.txt: Check before scraping
Deduplicate: Normalize emails (lowercase, trim)
Verify: Use MX record checks or API verification
Filter: Remove noreply@, donotreply@ addresses

Legal & Ethical

Comply with GDPR/CCPA
Respect terms of service
Honor opt-out requests
Don't spam discovered emails

Integration

Works well with:

leads-researcher - Discover contact emails after researching companies
copywriter - Use found emails for outreach campaigns

For complete implementation code, API examples, verification patterns, and rate limiting utilities, see: references/full-guide.md