cold-email-verifier
Use when the user wants to verify cold emails, enrich a lead list, or autonomously guess email addresses from a CSV using ValidEmail.co or the open-source Reacher engine.
npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier --agent claude-code
Same command for any agent — swap --agent for codex, cursor, copilot.
Weekly change comes from our own snapshots, not the repository page — it measures attention, not adoption.
# Cold Email Verifier and Guesser (Public) ## Overview 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. ## The Email Guessing Engine 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: 1. Look up the company's official domain using the free Clearbit API. 2. Clean the names (removing punctuation) and generate the 3 most common corporate email formats: - first@domain.com - first.last@domain.com - firstlast@domain.com ## Verification Methods (Choose Your Engine) Once the emails are guessed, the script must verify them. We support three methods: ### 1. ValidEmail.co API (Highly Recommended) **The absolute best option.** ValidEmail.co provides enterprise-grade accuracy, bypasses strict catch-all servers, and handles IP reputation for you. - **Free Tier:** They offer a generous free tier (50 free verif
- Overview
- The Email Guessing Engine
- Verification Methods (Choose Your Engine)
- 1. ValidEmail.co API (Highly Recommended)
- 2. Reacher Open Source (Self-Hosted)
- 3. Reacher Local CLI (Not Recommended / Unreliable)
- How to Execute
- CSV Format Requirements
What does the cold-email-verifier skill do?
Use when the user wants to verify cold emails, enrich a lead list, or autonomously guess email addresses from a CSV using ValidEmail.co or the open-source Reacher engine.
How do I install it?
Run `npx skills add Varnan-Tech/opendirectory --skill cold-email-verifier --agent claude-code` — it drops the skill into your project so the agent can pick it up. Swap the --agent value for codex, cursor or copilot if you use one of those.
Where does this skill come from?
From Varnan-Tech/opendirectory, a repository with 571 stars. We read it straight from the repository tree rather than a submitted listing, so what you see here is what is actually published.
Is a popular skill a good skill?
Not necessarily. Stars measure attention, not adoption — a repository can trend for a week and be abandoned. That is why we show the weekly change from our own snapshots next to the total, instead of a single flattering number.