How does the skill identify valid email addresses?

It employs multiple protocol-level techniques, specifically querying the SMTP server with VRFY, EXPN, and RCPT TO commands to determine if specific usernames exist.

Is this tool suitable for beginners in cybersecurity?

While it provides comprehensive commands and workflows, it requires a baseline understanding of networking and command-line security tools to interpret results effectively.

Can this skill help prevent email spoofing?

Yes, it includes procedures to analyze SPF, DKIM, and DMARC records, which are the primary DNS-based defenses against domain spoofing and unauthorized mail delivery.

What is an open relay and why is it tested?

An open relay is an SMTP server that allows anyone to send email through it. Testing identifies these because they are frequently abused by spammers to hide their identity.

What tools are required to use this SMTP penetration testing skill?

The skill utilizes standard security utilities including Nmap, Netcat, Hydra, smtp-user-enum, and the Metasploit Framework to perform various stages of testing.

SMTP Security & Penetration Testing

Name: SMTP Security & Penetration Testing
Author: claudiodearaujo

byclaudiodearaujo

0•

セキュリティとテスト

Performs comprehensive security assessments of SMTP servers to identify vulnerabilities like open relays, user enumeration, and weak authentication.

This skill provides a structured framework for evaluating the security posture of mail servers by automating common penetration testing workflows. It enables security professionals and developers to conduct thorough audits using industry-standard tools for service discovery, banner grabbing, and multi-method user enumeration. By testing for unauthorized relaying and auditing credential strength, it helps identify critical misconfigurations before they can be exploited, while also providing hardening recommendations for TLS and email authentication protocols like SPF, DKIM, and DMARC.

主な機能

01Authentication auditing via brute-force testing with common wordlists

020 GitHub stars

03Automated SMTP service discovery and banner grabbing

04Multi-vector user enumeration using VRFY, EXPN, and RCPT TO

05Security analysis of TLS/SSL configurations and email authentication records

06Comprehensive open relay vulnerability testing and exploitation analysis

ユースケース

01Conducting authorized security audits of corporate mail infrastructure

02Verifying mail server hardening and configuration compliance

03Identifying exposed user accounts for proactive defense and phishing simulations

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

主な機能

01Authentication auditing via brute-force testing with common wordlists

020 GitHub stars

03Automated SMTP service discovery and banner grabbing

04Multi-vector user enumeration using VRFY, EXPN, and RCPT TO

05Security analysis of TLS/SSL configurations and email authentication records

06Comprehensive open relay vulnerability testing and exploitation analysis

ユースケース

01Conducting authorized security audits of corporate mail infrastructure

02Verifying mail server hardening and configuration compliance

03Identifying exposed user accounts for proactive defense and phishing simulations

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