Skill

email-finder

This skill should be used when users need to find email addresses associated with a domain. It activates when users ask to scan a domain for emails, find contact emails, discover email addresses, or replace email hunter functionality.

Install

npx claudepluginhub joshuarweaver/cascade-business-ops --plugin shipshitdev-library

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

Parent Repo Stars8

Parent Repo Forks1

Last CommitJan 20, 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