Cold Email Verifier
This skill autonomously processes a CSV of leads (containing First Name, Last Name, and Company Name), discovers their corporate domain, generates profession...
npx skills add Varnan-Tech/opendirectoryDescription
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.
What this skill does
- 1Accepts a CSV of leads with first name, last name, and company name; auto-discovers corporate domains via the Clearbit API.
- 2Generates the three most common email permutations (first@domain, first.last@domain, firstlast@domain) for each lead.
- 3Verifies deliverability via ValidEmail.co API (recommended) or a self-hosted Reacher instance, outputting a verified leads CSV.
- 4Reports verification results with clear pass/fail status per address and skips residential IP verification due to Port 25 blocking.
When to use
- You have a lead list with names and companies but no email addresses and need to find and verify them at scale.
- You want to clean an existing email list before a cold outreach campaign to reduce bounce rates.
- You need a fully self-contained email guessing and verification pipeline that works without a paid enrichment tool.
Best for
Format
Frequently asked questions
What is Cold Email Verifier?
Cold Email Verifier is a Claude Code skill for outbound by Varnan Tech. This skill autonomously processes a CSV of leads (containing First Name, Last Name, and Company Name), discovers their corporate domain, generates profession...
When should I use Cold Email Verifier?
You have a lead list with names and companies but no email addresses and need to find and verify them at scale. You want to clean an existing email list before a cold outreach campaign to reduce bounce rates.
How do I install Cold Email Verifier?
Run the install command (npx skills add Varnan-Tech/opendirectory). Once the skill is in place, Claude Code loads it automatically whenever a task matches what it does.
Is Cold Email Verifier free to use?
Yes. Cold Email Verifier is open source under the MIT license, published in the Varnan-Tech/opendirectory repository on GitHub.