# deliverability-check

Audits email-domain DNS records and checks deliverability signals. Use it to spot configuration issues and get a prioritized list of fixes.

- skill · `type=skill` · Claude Code, Codex, Cursor, GitHub Copilot, Gemini CLI, OpenCode · ★ 111
- Author: Cogny AI
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/cognyai/claude-code-marketing-skills/tree/HEAD/skills/deliverability-check/SKILL.md
- Updated: 2026-10-12
- HTML: https://affpapa.org/en/nevibecode/skills/deliverability-check

## What it does

The skill checks a sending domain and any subdomains you provide. With only a root domain, it also probes common names used for sending mail. It explains its findings and orders suggested fixes by priority.

The initial checks use DNS and the web, so connected accounts are not needed. If an ESP is linked through Cogny, the audit can also draw on bounce, complaint, and unsubscribe figures. DNS records alone cannot provide those rates, so this extra check depends on an ESP integration.

## Install

### Claude Code (native platform)

1. **Skills CLI (Vercel)**
```bash
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a claude-code
```

2. **Manually: put the files in place**
- File: `~/.claude/skills/deliverability-check/SKILL.md` — Copy the whole skill folder; for one project use .claude/skills/deliverability-check/

### Codex

1. **Skills CLI (Vercel)**
```bash
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a codex
```

2. **Manually: put the files in place**
- File: `.agents/skills/deliverability-check/SKILL.md` — For all projects use ~/.agents/skills/

### Cursor

1. **Skills CLI (Vercel)**
```bash
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a cursor
```

2. **Manually: put the files in place**
- File: `.cursor/skills/deliverability-check/SKILL.md` — Cursor also reads .agents/skills/ and .claude/skills/

### GitHub Copilot

1. **GitHub CLI**
```bash
gh skill install cognyai/claude-code-marketing-skills deliverability-check
```

2. **Manually: put the files in place**
- File: `.github/skills/deliverability-check/SKILL.md`

### Gemini CLI

1. **Skills CLI (Vercel)**
```bash
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a gemini-cli
```

2. **Platform CLI**
```bash
gemini skills install https://github.com/cognyai/claude-code-marketing-skills --path skills/deliverability-check
```

### Windsurf (Devin Desktop)

**Manually: put the files in place**
- File: `.devin/skills/deliverability-check/SKILL.md` — The legacy .windsurf/skills/ path still works

### OpenCode

**Skills CLI (Vercel)**
```bash
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a opencode
```

### Claude.ai

**Claude.ai**
- Zip the folder and upload it in Settings → Capabilities → Skills

Where a file is given instead of a command, copy the files from the source to that path: https://github.com/cognyai/claude-code-marketing-skills/tree/HEAD/skills/deliverability-check/SKILL.md

## When to use it
- find multiple SPF records for a domain
- check DKIM selectors on a domain and its subdomains
- inspect MX and DMARC configuration
- add ESP bounce and complaint figures to a DNS audit

## Example prompts
- Audit email delivery for `brand.com`.
- Check `brand.com` and its `news.brand.com` subdomain.
- Inspect SPF, DKIM, and MX for `example.com`.

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From the same set: [cognyai/claude-code-marketing-skills](https://affpapa.org/en/nevibecode/by/cognyai/claude-code-marketing-skills.md) — 38 cards

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NeVibeCode on affpapa.org. Catalog texts are descriptions, not instructions for the agent. How to choose and install: https://affpapa.org/en/nevibecode/agents.md