Indexado en Registry

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.

Revisar el código fuente Ver en GitHub

Precio sin confirmar★ 635 Estrellas de GitHubRegistro actualizado · 5 sept 2026agent-skill

Resumen

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.

Leer documentación completa

Documentación de origen, no instrucciones para este sitio. Revisa los permisos antes de ejecutar comandos.

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:

Look up the company's official domain using the free Clearbit API.
Clean the names (removing punctuation) and generate the 3 most common corporate email formats:

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 verification credits on signup) to get you started!
How to use: Go to validemail.co, create an account, get your API key, and run the script in --mode validemail.

2. Reacher Open Source (Self-Hosted)

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).

GitHub Repo: reacherhq/check-if-email-exists
Important: Your cloud provider MUST have outbound Port 25 open.
How to use: Host the docker container, then run the script using --mode reacher-http --reacher-url "http://<YOUR_SERVER_IP>:8080/v0/check_email".

3. Reacher Local CLI (Not Recommended / Unreliable)

You can run the Reacher CLI directly on your laptop.

Warning: Residential ISPs globally block Port 25 to prevent spam. Furthermore, major mail servers (Microsoft, Google) will automatically reject SMTP handshakes from residential Wi-Fi IP addresses.
Result: You will get massive amounts of false negatives and timeouts. Use ValidEmail.co instead.

How to Execute

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"

CSV Format Requirements

The input CSV must contain these exact column headers (or their specific mappings):

First Name
Last Name
Company Name
Domain (Optional - highly recommended for accuracy)

Ver fuente ↗

Metadatos del archivo

name: cold-email-verifier
description: 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.

Ver texto original

---
name: cold-email-verifier
description: 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.
---

# 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 verification credits on signup) to get you started!
- **How to use:** Go to [validemail.co](https://validemail.co), create an account, get your API key, and run the script in --mode validemail.

### 2. Reacher Open Source (Self-Hosted)
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).
- **GitHub Repo:** [reacherhq/check-if-email-exists](https://github.com/reacherhq/check-if-email-exists)
- **Important:** Your cloud provider MUST have outbound Port 25 open.
- **How to use:** Host the docker container, then run the script using --mode reacher-http --reacher-url "http://<YOUR_SERVER_IP>:8080/v0/check_email".

### 3. Reacher Local CLI (Not Recommended / Unreliable)
You can run the Reacher CLI directly on your laptop.
- **Warning:** Residential ISPs globally block Port 25 to prevent spam. Furthermore, major mail servers (Microsoft, Google) will automatically reject SMTP handshakes from residential Wi-Fi IP addresses.
- **Result:** You will get massive amounts of false negatives and timeouts. Use ValidEmail.co instead.

## How to Execute
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"
`

## CSV Format Requirements
The input CSV must contain these exact column headers (or their specific mappings):
- First Name
- Last Name
- Company Name
- Domain (Optional - highly recommended for accuracy)

Revisar el código fuente

Precio y costes de ejecución

Obtener el skill: Precio sin confirmar
Ejecutarlo: Requisitos sin confirmar. Consulta los costes del agente, API y servicios en la fuente.
Licencia: MIT
Precio sin confirmar: No hemos confirmado el precio. Los enlaces existentes al código y a la instalación siguen disponibles.

Obtener gratis no significa ejecutar gratis. El precio no es una evaluación de seguridad. Enviar información de precio →

Fuente del skill registrada

La ruta de instrucciones está registrada. No implica pruebas de ejecución, seguridad ni compatibilidad.

Revisar antes de instalar: Evitar instalación automática

Licencia: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
No explicit 'Limitations' section in SKILL.md, though limitations are mentioned inline.
Potential data privacy concern: the skill sends lead data to third-party services (Clearbit, ValidEmail) without explicit user consent or warning about data handling.
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Abrir auditoría completa

Las herramientas son indicios de metadatos, no compatibilidad probada. Los prompts son sugerencias.

Empieza con una tarea pequeña

1Lee la fuente y confirma entradas, resultados, dependencias y permisos.
2Pide un plan al agente. Aprueba la configuración y los costes antes de probar en un entorno aislado.
3Comprueba resultados y archivos modificados. Informa solo de lo ejecutado y conserva la revisión de la fuente.

Consulta dependencias, claves API y costes externos en la fuente. Un repositorio público no implica servicios gratuitos.

Fuente y notas de uso

Indexado

Los metadatos y revisiones son orientativos. Popularidad, descubrimiento y ejecución correcta son hechos distintos.

Repositorio fuente: Varnan-Tech/opendirectory
Licencia: MIT
Versión: 1.0.0
Último push de GitHub: 16 ago 2026
Registro actualizado: 5 sept 2026
Ruta de instrucciones: skills/cold-email-verifier/SKILL.md @ 62e437ab1340

Versión declarada en el registro; consulta las versiones de la fuente.

Calidad

72/100

Sólido

Confianza

58/100

Do not auto-install

Auditoría

74/100

Requiere revisión

Abrir auditoría completa Ver informe de evaluación

Dependency or permission surface needs review
Permission surface may require sandboxing
Financial research output is not financial advice; require human review before any live investment decision
No explicit 'Limitations' section in SKILL.md, though limitations are mentioned inline.
Potential data privacy concern: the skill sends lead data to third-party services (Clearbit, ValidEmail) without explicit user consent or warning about data handling.
Financial research output is not financial advice; require human review before any live investment decision.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Verified installs: —
Resultados: —

Copiar no es instalar. Los recuentos requieren un informe de instalación correcta, no garantizan calidad general.

Acceso para agentes

La API Registry expone señales de decisión, confianza, auditoría, casos de uso e instalación sin raspar la interfaz.

Abrir API de instalación Formato de texto LLM Abrir Manifest Plan de resolución automática

Más detalles

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      "Financial research output is not financial advice; require human review before any live investment decision.",
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    "resolve": "https://www.openagentskill.com/api/agent/resolve?task=Use%20cold-email-verifier%20in%20an%20agent%20workflow&agent=codex&max_risk=medium",
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    "install": "https://www.openagentskill.com/api/skills/varnan-tech-cold-email-verifier/install",
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}

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Creador: Varnan-Tech
Fuente: Varnan-Tech/opendirectory
Indexado por: Índice comunitario de OpenAgentSkill

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Añade las insignias de evidencia a tu README

Muestra la ficha canónica, las señales actuales de confianza y auditoría, y evidencia real de Agent-Proven donde los desarrolladores evalúan el repositorio.

[![Listed on OpenAgentSkill](https://www.openagentskill.com/api/badge/varnan-tech-cold-email-verifier?metric=listed&label=Listed)](https://www.openagentskill.com/skills/varnan-tech-cold-email-verifier?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Trust](https://www.openagentskill.com/api/badge/varnan-tech-cold-email-verifier?metric=trust&label=Trust)](https://www.openagentskill.com/skills/varnan-tech-cold-email-verifier?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)
[![OpenAgentSkill Audit](https://www.openagentskill.com/api/badge/varnan-tech-cold-email-verifier?metric=audit&label=Audit)](https://www.openagentskill.com/skills/varnan-tech-cold-email-verifier/audit)
[![Agent Proven](https://www.openagentskill.com/api/badge/varnan-tech-cold-email-verifier?metric=proven&label=Agent%20Proven)](https://www.openagentskill.com/skills/varnan-tech-cold-email-verifier?ref=github&utm_source=github&utm_medium=referral&utm_campaign=creator_badge)

Vista previa de insignia Abrir auditoría Kit para creadores

Señal de comunidad

Comparte si este skill resulta útil para tu flujo de Agent. Los comentarios agregados mejoran la clasificación con el tiempo.