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smtp-penetration-testing

This skill should be used when the user asks to "perform SMTP penetration testing", "enumerate email users", "test for open mail relays", "grab SMTP banners", "brute force email credentials", or "assess mail server security". It provides comprehensive techniques for testing SMTP server security.

cli-tool/components/skills/security/smtp-penetration-testing/SKILL.md

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Nov 8, 2026
License
MIT

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# SMTP Penetration Testing

## Purpose

Conduct comprehensive security assessments of SMTP (Simple Mail Transfer Protocol) servers to identify vulnerabilities including open relays, user enumeration, weak authentication, and misconfiguration. This skill covers banner grabbing, user enumeration techniques, relay testing, brute force attacks, and security hardening recommendations.

## Prerequisites

### Required Tools
```bash
# Nmap with SMTP scripts
sudo apt-get install nmap

# Netcat