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Verifies and guesses cold email addresses from a CSV using ValidEmail.co or Reacher engine. Processes leads with First Name, Last Name, Company Name to discover domains and generate email permutations.
How this skill is triggered — by the user, by Claude, or both
Slash command
/opendirectory-gtm-skills:cold-email-verifierThe summary Claude sees in its skill listing — used to decide when to auto-load this skill
This skill autonomously processes a CSV of leads (containing First Name, Last Name, and Company Name), discovers their corporate domain, generates professional email permutations, and strictly verifies their deliverability.
This skill autonomously processes a CSV of leads (containing First Name, Last Name, and Company Name), discovers their corporate domain, generates professional email permutations, and strictly verifies their deliverability.
It is designed to solve the problem of missing contact info by guessing core email angles and then checking which one is real.
You don't need to provide emails in your CSV! If the CSV only contains First Name, Last Name, and Company Name, the script will automatically:
Once the emails are guessed, the script must verify them. We support three methods:
The absolute best option. ValidEmail.co provides enterprise-grade accuracy, bypasses strict catch-all servers, and handles IP reputation for you.
If you want a 100% free, open-source solution, you can host the Reacher backend yourself on a cloud provider (like AWS, GCP, or Hetzner).
You can run the Reacher CLI directly on your laptop.
First, ensure dependencies are installed: pip install -r requirements.txt
To use ValidEmail.co (Recommended):
ash export VALIDEMAIL_API_KEY="your_api_key_here" python scripts/email_verifier.py --input leads.csv --output verified_leads.csv --mode validemail
To use Self-Hosted Reacher:
ash python scripts/email_verifier.py --input leads.csv --output verified_leads.csv --mode reacher-http --reacher-url "http://your-server-ip:8080/v0/check_email"
The input CSV must contain these exact column headers (or their specific mappings):
npx claudepluginhub varnan-tech/opendirectory --plugin opendirectory-gtm-skillsAutomates Hunter.io email intelligence: search domains for emails, find specific contacts, verify deliverability, manage leads, and monitor usage via natural language commands through Composio MCP.
Builds verified business email lists from Google Maps, Google SERPs, or URL lists with built-in email verification. Replaces tools like Apollo or Hunter.
Validates emails from a CSV before campaign sending, removing invalid, do_not_mail, abuse, catch-all, and unknown addresses. Fits between email-generation and campaign-sending in the pipeline.