domain-health SKILL.md skillA
domain-health from realjaymes/marketingagentskills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add realjaymes/marketingagentskills/domain-health@v1.0.0Pins v1.0.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- realjaymes/marketingagentskills
- Path
skills/domain-health/SKILL.md- Versions recorded
- 1
- Latest version
- v1.0.0, committed Sep 22, 2026
- Size
- 5,976 bytes
- Repository stars
- 66
- License
- MIT
When the user wants to check email deliverability posture, domain authentication, or sending reputation for a domain. Use when the user mentions "domain health," "inbox health," "deliverability," "SPF," "DKIM," "DMARC," "email authentication," "are my emails landing in spam," "can I send from this domain," "is my domain spoofable," "warm up a domain," "check this sending domain," "DMARC rollout," "p=quarantine," "p=reject," "blacklisted," or "email going to spam." Also use before starting cold…
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
# Domain Health Email authentication and deliverability posture for any domain, using only `dig` and the standard library. No API key, no paid tool, no per-check cost. The same DNS primitives serve two opposite jobs, which is why they live in one skill: **Defensive.** Audit a domain you own before you send from it, and before you tighten a DMARC policy. Getting this wrong silently sends your own invoices and password resets to spam. **Offensive.** Score a prospect's domain to find a real, specific gap worth opening a cold email with. ## When to run it Before starting outbound from any domain. Before changing a DMARC policy. When email is landing in spam and nobody knows why. When enriching a prospect list with a technical hook. After adding any new sending tool, because that is when sender inventory drifts. ## Modes **Audit** (default) runs against domains you own. ```bash python3 scripts/domain_health.py --domain example.com python3 scripts/domain_health.py --domain example.com --json python3 scripts/domain_health.py domains.txt ``` **Prospect** produces a CSV for list enrichment, with a `gap` column that is true when the domain's DMARC is missing or monitoring-only. …
Read the whole file at its exact version.
How to install
mdr add realjaymes/marketingagentskills/domain-health@sha256:158d46c26e2d3fa4The line at the top of this page pins the label v1.0.0, 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_4pruwvw3krmougr6)
1 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 1 version of this file, committed on Sep 22, 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 (5976 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
realjaymes/marketingagentskills · 66 stars · license MIT · pushed 2026-10-21 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_4pruwvw3krmougr6 GET https://markdownregistry.com/api/v1/resolve?ref=realjaymes/marketingagentskills/domain-health GET https://markdownregistry.com/api/v1/blob/158d46c26e2d3fa425d248439e2e5c5260cf633d87a89fc6f5a5c8d7b9d3beff
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.