deliverability-check — Claude Code skill: domain audit
Audits email-domain DNS records and checks deliverability signals. Use it to spot configuration issues and get a prioritized list of fixes.
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a claude-codeWhat deliverability-check 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.
What it helps with
- 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 for the agent
- Audit email delivery for
brand.com. - Check
brand.comand itsnews.brand.comsubdomain. - Inspect SPF, DKIM, and MX for
example.com.
How to install deliverability-check
1Skills CLI (Vercel)
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a claude-code2Manually: put the files in place
~/.claude/skills/deliverability-check/SKILL.mdCopy the whole skill folder; for one project use .claude/skills/deliverability-check/
1Skills CLI (Vercel)
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a codex2Manually: put the files in place
.agents/skills/deliverability-check/SKILL.mdFor all projects use ~/.agents/skills/
1Skills CLI (Vercel)
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a cursor2Manually: put the files in place
.cursor/skills/deliverability-check/SKILL.mdCursor also reads .agents/skills/ and .claude/skills/
1GitHub CLI
gh skill install cognyai/claude-code-marketing-skills deliverability-check2Manually: put the files in place
.github/skills/deliverability-check/SKILL.md1Skills CLI (Vercel)
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a gemini-cli2Platform CLI
gemini skills install https://github.com/cognyai/claude-code-marketing-skills --path skills/deliverability-checkManually: put the files in place
.devin/skills/deliverability-check/SKILL.mdThe legacy .windsurf/skills/ path still works
Skills CLI (Vercel)
npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a opencodeClaude.ai
Zip the folder and upload it in Settings → Capabilities → Skills
Step by step, with commands for each platform: How to install skills in Claude Code: five ways
Questions about deliverability-check
How do I install deliverability-check in Claude Code?
Run npx skills add cognyai/claude-code-marketing-skills --skill deliverability-check -a claude-code. The skill file is installed at ~/.claude/skills/deliverability-check/SKILL.md.
What does deliverability-check do?
It audits email-related DNS settings and returns findings with fixes ordered by priority. An ESP connected through Cogny can contribute campaign delivery metrics.
Does the audit need an email service account?
DNS checks work without connected accounts. An ESP integration through Cogny is needed for bounce, complaint, and unsubscribe figures.
