email-security SKILL.md skillA
email-security from miosa-osa/osa is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add miosa-osa/osa/email-security@v1.0.200Pins v1.0.200 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- miosa-osa/osa
- Path
priv/skills/email-security/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.200, committed Sep 14, 2026
- Size
- 2,216 bytes
- Repository stars
- 78
- License
- Apache-2.0
Analyze suspicious email headers and attachments without opening active content, distinguish trusted authentication results and plan mail defenses. Use for phishing triage, email security, spoofed sender or SPF DKIM DMARC evidence.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Email Security ## Workflow 1. Preserve raw EML and hash; never follow links or render remote content during triage. 2. Extract selected headers using the bundled parser. Read the worked example for trust boundaries. 3. Identify the receiving organization's trusted authentication service before interpreting Authentication-Results. Attacker-supplied headers can lie. 4. Compare visible sender, envelope identity, DKIM signing domain and documented alignment results; auth pass alone does not establish harmless content. 5. Hash attachments without execution, record duplicate headers and parsing anomalies, and pass samples to sandbox-triage when needed. 6. Propose narrow mail controls, test known good mail and the offending sample, and document rollback and delivery impact. ## Worked example and prerequisites Read [references/workflow.md](references/workflow.md) before execution. Use only registered OSA tools named in the frontmatter; command examples run through `shell_execute`. Check `command -v` for each external executable on the actual target. Optional packages, external collectors and vendor accounts are not bundled or presumed installed. ## Evidence and completion …
Read the whole file at its exact version.
How to install
mdr add miosa-osa/osa/email-security@sha256:e93d75fe9d27ff7fThe line at the top of this page pins the label v1.0.200, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_ksx5plzukkaha24e)
4 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 14, 2026.
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (2216 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
miosa-osa/osa · 78 stars · license Apache-2.0 · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_ksx5plzukkaha24e GET https://markdownregistry.com/api/v1/resolve?ref=miosa-osa/osa/email-security GET https://markdownregistry.com/api/v1/blob/e93d75fe9d27ff7f1412985c240bf03d366da718feb173acfdb62ad9a7ee9fd4
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.