How does this skill improve email deliverability?

By identifying open relays and analyzing SPF, DKIM, and DMARC records, it helps administrators fix misconfigurations that often lead to domain blacklisting and spam flags.

Does this skill automate the penetration test?

It provides the specific commands, tool configurations, and logic required for tools like Nmap, Hydra, and Metasploit, which Claude can then help you execute or interpret.

Can I use this skill to test any email server?

No. Penetration testing should only be performed on systems you own or have explicit, written authorization to test to ensure legal and ethical compliance.

What tools are required for this skill?

The skill utilizes industry-standard tools including Nmap, Netcat, Hydra, smtp-user-enum, and the Metasploit Framework.

What is the SMTP Penetration Testing skill?

It is a specialized capability for Claude Code that provides structured workflows, command patterns, and best practices for auditing the security of mail servers.

SMTP Penetration Testing

Name: SMTP Penetration Testing
Author: claudiodearaujo

byclaudiodearaujo

Security & Testing

Performs comprehensive security audits and vulnerability assessments on SMTP mail servers to identify misconfigurations and exposure risks.

About

This skill provides specialized workflows for conducting deep security evaluations of Simple Mail Transfer Protocol (SMTP) infrastructure. It enables Claude to guide users through structured phases of a security audit, including service discovery, banner grabbing, and advanced user enumeration using techniques like VRFY and EXPN. The skill is designed to identify critical vulnerabilities such as open relays, weak authentication, and command injection, while also providing analysis patterns for email security protocols like SPF, DKIM, and DMARC to prevent spoofing and domain abuse.

Key Features

Email authentication analysis for SPF, DKIM, and DMARC records
Comprehensive open relay vulnerability identification and testing
Automated SMTP service discovery and banner grabbing workflows
Advanced user enumeration using VRFY, EXPN, and RCPT methods
0 GitHub stars
Guided brute-force simulations for testing credential strength

Use Cases

Auditing enterprise mail servers for misconfigurations and data leaks
Hardening email infrastructure against spoofing and phishing attacks
Identifying unauthorized open relays to prevent domain blacklisting

What are Skills?·How to Install

Install with 🐟 Skill.Fish

npx skillfish add claudiodearaujo/sistema-de-narra-o-de-livro-front smtp-penetration-testing

For use in Claude.ai and ChatGPT

Download Skill

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