email-header-injection
Email header injection and spoofing playbook
Install / Use
npx skills add yaklang/hack-skills --skill email-header-injectionInstalls into whichever agent you are using.
SKILL.md
Installable skill definition
Quality Score
Category
CommunicationSupported Platforms
Our assessment of email-header-injection
email-header-injection scores 79/100 on our quality scale, 262nd of 308 Communication skills we index.
We have not analysed the SKILL.md file itself yet, so the content part of this score is an estimate until our crawler reaches it.
With 2,288 GitHub stars, it is one of the more widely adopted skills in the catalogue.
Maintenance, license and trust
- The repository was last updated 15 days ago, so email-header-injection is actively maintained.
- It is released under the MIT license, a permissive license that allows use, modification and commercial use with attribution.
- Its trust signals score 100/100, with no cautions. These come from repository metadata, not a code audit — read the skill file before letting an agent act on it.
email-header-injection compared with similar skills
All 4 of these similar skills score higher than email-header-injection; compare them before choosing.
| Skill | Score | Stars | Updated | Format |
|---|---|---|---|---|
| email-header-injection (this skill)by yaklang | 79 | 2.3k | 15d ago | SKILL.md |
| Agent-Reachby Panniantong | 100 | 86.1k | 13d ago | CLAUDE.md |
| headroomby headroomlabs-ai | 100 | 74.1k | today | CLAUDE.md |
| crawl4aiby unclecode | 100 | 84.4k | 4d ago | MCP Server |
| Scraplingby D4Vinci | 100 | 84.4k | today | MCP Server |
Frequently asked questions
- How do I install email-header-injection?
- Run
npx skills add yaklang/hack-skills --skill email-header-injection. The install tabs above show the steps for each supported agent. - Which AI agents does email-header-injection work with?
- It is written for Universal, as a SKILL.md file. Other agents that read the same format can often use it too.
- Is email-header-injection safe to use?
- It is MIT-licensed and scores 100/100 on trust signals. Skills are instructions an agent will follow, so read the file before installing it and do not approve commands you do not understand.
- Is email-header-injection still maintained?
- The repository was last updated 15 days ago, so email-header-injection is actively maintained.
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Languages
Trust signals
From repository metadata: license, adoption, age and documentation. Not a code audit — see the Safety scan above for what the skill file itself contains.