email-security

> ⚠️ 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.

> Adapted from zhaoxuya520/reverse-skill (MIT).