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.
Installation
SKILL.md
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.
| HELO | Identify client | HELO client.com | | EHLO | Extended HELO | EHLO client.com | | MAIL FROM | Set sender | MAIL FROM: | | RCPT TO | Set recipient | RCPT TO: | | DATA | Start message body | DATA | | VRFY | Verify user | VRFY admin | | EXPN | Expand alias | EXPN staff | | QUIT | End session | QUIT |
| 220 | Service ready | | 221 | Closing connection | | 250 | OK / Requested action completed | | 354 | Start mail input | | 421 | Service not available | | 450 | Mailbox unavailable | | 550 | User unknown / Mailbox not found | | 553 | Mailbox name not allowed |
Facts (cite-ready)
Stable fields and commands for AI/search citations.
- Install command
npx skills add https://github.com/sickn33/antigravity-awesome-skills --skill smtp penetration testing- Category
- </>Dev Tools
- Verified
- ✓
- First Seen
- 2026-02-01
- Updated
- 2026-02-18
Quick answers
What is 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. Source: sickn33/antigravity-awesome-skills.
How do I install smtp penetration testing?
Open your terminal or command line tool (Terminal, iTerm, Windows Terminal, etc.) Copy and run this command: npx skills add https://github.com/sickn33/antigravity-awesome-skills --skill smtp penetration testing Once installed, the skill will be automatically configured in your AI coding environment and ready to use in Claude Code or Cursor
Where is the source repository?
https://github.com/sickn33/antigravity-awesome-skills
Details
- Category
- </>Dev Tools
- Source
- skills.sh
- First Seen
- 2026-02-01