deliverability-check SKILL.md skillA
deliverability-check from ekos-labs/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add ekos-labs/skills/deliverability-check@v0.1.0Pins v0.1.0 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- ekos-labs/skills
- Path
skills/deliverability-check/SKILL.md- Versions recorded
- 2
- Latest version
- v0.1.0, committed Oct 15, 2026
- First version recorded
- Oct 15, 2026
- Size
- 2,766 bytes
- Repository stars
- 6
- License
- MIT
Check a sending domain's SPF, DKIM and DMARC records with public DNS lookups, scan outreach drafts and links for spam triggers, and return a plain-language pass or fix list. Use before any cold email campaign or when replies suddenly drop.
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
# Deliverability Check Make sure emails can land in the inbox before a single one is sent. Execution mode: agent-native. Uses public DNS lookups (`dig` or `nslookup`) and reads the drafts. No API key needed. Example request: "Check outreach.acme.com before we start the campaign. Here are the drafts." ## Inputs - The sending domain (the part after @ in the from address) and the email provider (Google Workspace, Microsoft 365, other). - The DKIM selector if known (Google: `google`; Microsoft: `selector1` and `selector2`). - The drafts. ## Method 1. **SPF:** `dig +short TXT <domain>`. Exactly one record starting `v=spf1`, includes the provider, ends in `~all` or `-all`, and stays under 10 DNS lookups. 2. **DKIM:** `dig +short TXT <selector>._domainkey.<domain>`. A key exists for the provider's selector. 3. **DMARC:** `dig +short TXT _dmarc.<domain>`. A record exists, at least `p=none` with a `rua` address; recommend moving to `quarantine` once reports are clean. 4. **MX and return path:** MX records exist so replies work. …
Read the whole file at its exact version.
How to install
mdr add ekos-labs/skills/deliverability-check@sha256:65e3e8e9f3ba4be3The line at the top of this page pins the label v0.1.0, 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_d2q4zfa53bur5d4e)
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Versions
The registry has recorded 2 versions of this file, all committed on Oct 15, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| v0.1.0 latest | 2026-10-15 | a4755e4 | 2,766 B | A | view · diff |
| v0.1.0 | 2026-10-15 | f8e228e | 2,230 B | A | view |
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 (2766 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
ekos-labs/skills · 6 stars · license MIT · pushed 2026-11-07 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_d2q4zfa53bur5d4e GET https://markdownregistry.com/api/v1/resolve?ref=ekos-labs/skills/deliverability-check GET https://markdownregistry.com/api/v1/blob/65e3e8e9f3ba4be3e7975968b401138f56a4205ee3c4836cbc4c671a6d88c3fb
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.
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