Smtp Penetration Testing

This covers the full SMTP penetration testing workflow, from banner grabbing and service discovery through user enumeration, open relay testing, and brute force authentication attempts. You get practical commands for tools like Nmap, Hydra, smtp-user-enum, and Metasploit, plus manual testing via netcat and telnet. The workflow is solid for authorized security assessments, walking through VRFY/EXPN/RCPT enumeration methods, relay testing variations, and checking email authentication records like SPF and DMARC. It's comprehensive but assumes you already have authorization and understand the legal boundaries. The reference tables for SMTP commands and response codes are genuinely useful for quick lookups during an engagement.

skills.sh installs: 186
GitHub stars: 39.4K
last updated: Jun 3, 2026

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Install

$ npx -y skills add sickn33/antigravity-awesome-skills --skill smtp-penetration-testing --agent claude-code

Installs into .claude/skills of the current project.

Files

⚠️ AUTHORIZED USE ONLY This skill is for educational purposes or authorized security assessments only. You must have explicit, written permission from the system owner before using this tool. Misuse of this tool is illegal and strictly prohibited.

Mandatory confirmation gate Before running any command that probes, exploits, changes, persists on, extracts data from, or attempts credential access against a target:

Ask the user to state the exact target URL, IP, account, or resource.

Ask the user to confirm written authorization and the permitted scope.

Show the exact command(s) and explain their expected effect.

Wait for explicit confirmation in the current conversation.

Without that confirmation, remain read-only and provide defensive guidance only. Prefer a sandbox, disposable VM, or controlled lab.

AUTHORIZED USE ONLY: Use this skill only for authorized security assessments, defensive validation, or controlled educational environments.

SMTP Penetration Testing

Detailed Guide

SKILL.md on GitHub

Details

Repository: github.com/sickn33/antigravity-awesome-skills
Category: Testing & QA
First seen: Jun 3, 2026

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