Individual skill

network-email-security

Email security review: dissect phishing samples (headers, URLs, attachments), assess a domain's spoofability via SPF/DKIM/DMARC alignment, recognize BEC patterns, and audit tenant anti-phishing controls incl. OAuth consent abuse. Load on phishing email analysis, .eml header review, "can this domain be spoofed", DMARC/SPF checks, or BEC investigation. Signals: Received chain, Authentication-Results, dmarc p=none, ~all vs -all, reply-to mismatch, lookalike domains.

skills/network/network-email-security/SKILL.md

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Last checked: Nov 7, 2026

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Repository stars (not skill ratings): 27
Repository last updated: Oct 14, 2026
License: MIT

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security Derived category

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# Email security & phishing analysis

## When it applies
Two authorized jobs (`tradecraft-scope-roe`): **(a) defensive** — dissect a reported phishing
email or BEC attempt, extract IOCs, and recommend tenant controls (`defense-*` context); **(b)
offensive** — assess whether an in-scope domain can be spoofed (SPF/DKIM/DMARC posture) as
findings for a report. Sending simulated phishing is a separate, **pentest-only** track — load
`social-eng-methodology` first and never run it against a bug-bounty target. Never re-deliver
malicious samples to real users, and never mass-test third-party domains.

## Why it works
Spoofing succeeds when a domain's authentication records are missing, weak (`~all`, `p=none`), or
misaligned — the receiving server then has no cryptographic reason to reject a forged `From`. And
even with perfect auth, the *display name* and *Reply-To* are unauthenticated, which is what BEC