zebbern/claude-code-guide · skills/smtp-penetration-testing/SKILL.md

smtp-penetration-testing skillA

smtp-penetration-testing is agent-read markdown (skill) from zebbern/claude-code-guide: 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..

Indexed from public GitHub and served as immutable, content-addressed versions. Install it pinned to an exact SHA-256 with the mdr CLI, and every file is verified against the hash recorded here before it reaches your agent. The deterministic audit below grades the latest version, and the same file always earns the same grade.

How to install

Latest version
mdr add zebbern/claude-code-guide/smtp-penetration-testing@v1.1
Exact content
mdr add zebbern/claude-code-guide/smtp-penetration-testing@sha256:1f2a1ca7b95f91f0

Pin to a label to follow the author's releases, or to a sha256 to freeze the exact bytes forever. Either way the resolved hash is written to mdr.lock, and mdr install reproduces it on any machine.

Badge

mdr badge

[![mdr](https://markdownregistry.com/badge/art_zsqouzjulatyrwev.svg)](https://markdownregistry.com/a/art_zsqouzjulatyrwev)

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Versions

versioncommittedcommitsizeaudit
v1.1 latest2026-05-31 164971d 12,156 BA view · diff
v1.12026-01-20 27bf883 12,156 BA view · diff
git:20260104.9174e172026-01-04 9174e17 12,111 BA view

Audit of the latest version

A  17 of 17 checks passed. Deterministic, no model, same answer every run.
  • pass: Frontmatter block present
  • pass: Frontmatter declares a name
  • pass: Frontmatter declares a description
  • pass: Size between 200 bytes and 200 KB (12156 bytes)
  • pass: No zero-width or bidi control characters
  • pass: No instruction hidden inside an HTML comment
  • pass: No link to an exfiltration or paste host
  • pass: No credential-shaped string
  • pass: No instruction to send local credentials anywhere
  • pass: No text hidden with inline styles
  • pass: No prompt-injection phrasing
  • pass: No curl or wget piped into a shell
  • pass: No recursive delete of root, home or parent
  • pass: No instruction to read or print local credentials
  • pass: No base64 blob over 200 characters
  • pass: No link to a raw IP address
  • pass: No script tag

Source

GitHub

zebbern/claude-code-guide · 4,627 stars · license MIT · pushed 2026-09-18 · branch main

API

GET https://markdownregistry.com/api/v1/artifacts/art_zsqouzjulatyrwev
GET https://markdownregistry.com/api/v1/resolve?ref=zebbern/claude-code-guide/smtp-penetration-testing
GET https://markdownregistry.com/api/v1/blob/1f2a1ca7b95f91f038f6fb654ac4c676b0263ac5c9a6cd11df4adb98324eb7f6

Agents talk at modelranch.com: hand yours the instructions there and it joins the network that reads files like this one.