email-security – Marketing & SEO skill for AI agents
Authorized email security review: phishing analysis, SPF/DKIM/DMARC header authentication, BEC pattern investigation, and mailbox token abuse research.
Install the email-security skill with one command
Pick the tool you use, copy the command and paste it in your terminal. The skill lands in that tool's skills folder and is ready in your next session.
Claude Code
mkdir -p ~/.claude/skills && curl -fsSL https://skill.dn1nguoi.com/z/email-security-281ca.tgz | tar xz -C ~/.claude/skills
Call it in Claude Code: /email-security – then describe the task you want done.
Codex
mkdir -p ~/.codex/skills && curl -fsSL https://skill.dn1nguoi.com/z/email-security-281ca.tgz | tar xz -C ~/.codex/skills
Call it in Codex: $email-security – then describe the task you want done.
Hermes Agent
mkdir -p ~/.hermes/skills && curl -fsSL https://skill.dn1nguoi.com/z/email-security-281ca.tgz | tar xz -C ~/.hermes/skills
Call it in Hermes Agent: /email-security – then describe the task you want done.
DeepSeek
mkdir -p ~/.deepcode/skills && curl -fsSL https://skill.dn1nguoi.com/z/email-security-281ca.tgz | tar xz -C ~/.deepcode/skills
Call it in DeepSeek: /email-security – then describe the task you want done.
SKILL.md content
> ⚠️ AUTHORIZED USE ONLY
> This skill is for educational purposes or authorized security assessments only.
> You must have explicit, written permission from the system owner before using this tool.
> Misuse of this tool is illegal and strictly prohibited.
> Mandatory confirmation gate
> Before running any command that probes, exploits, changes, persists on, extracts data from, or attempts credential access against a target:
> 1. Ask the user to state the exact target URL, IP, account, or resource.
> 2. Ask the user to confirm written authorization and the permitted scope.
> 3. Show the exact command(s) and explain their expected effect.
> 4. Wait for explicit confirmation in the current conversation.
>
> Without that confirmation, remain read-only and provide defensive guidance only. Prefer a sandbox, disposable VM, or controlled lab.
Email Security & Phishing Analysis
When to Use
- Analyzing suspicious messages or domain spoofing exposure.
- Validating a domain's email authentication posture.
适用场景
- 钓鱼邮件拆解与 IOC
- SPF/DKIM/DMARC 配置评估
- BEC 商务邮件欺诈模式
- OAuth 应用钓鱼 / 邮箱令牌滥用（联合 llm/cloud 身份）
- 安全意识演练设计（授权）
工作流
□ 完整原始头：Received 链、From/Return-Path 一致性
□ SPF/DKIM/DMARC 对齐结果
□ URL 沙箱与附件静态（联合 malware-analysis）
□ 仿冒品牌与回复地址差异
□ 租户：反钓鱼策略、外部标记、MFA、OAuth app 同意工具链
| 工具 | 用途 |
|------|------|
| 邮件客户端「查看源」 | 头 |
| dig/nslookup | SPF/DMARC 记录 |
| urlscan / 沙箱 | 链接与附件 |
| 租户管理中心 | 策略 |
参考
references/email-auth-checklist.md../malware-analysis/../attack-chain/（钓鱼阶段）../windows-ad/（令牌）
路由上下文
上游: MASTER R36
MUST NOT: 未授权对第三方域群发测试钓鱼
任务完成自检
- [ ] 头认证结论是否完整？
- [ ] IOC 是否可检测化（联合 threat-hunting）？
- [ ] Checklist？
Limitations
- Live mailbox investigation touches personal data; minimize and anonymize.
- Header analysis cannot detect compromise that leaves no mail trail. SPF/DKIM/DMARC results are not a verdict that content is safe. Trust Authentication-Results only from the receiving infrastructure’s verified boundary; attackers can prepend forged headers. Never submit private message URLs or attachments to public analysis services without authorization.
> Adapted from [zhaoxuya520/reverse-skill](https://github.com/zhaoxuya520/reverse-skill) (MIT).
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