Domain Health Check

Check a list of domains for email blacklist listings (Spamhaus DBL, URIBL, SURBL + IP-based ZEN/SpamCop/Barracuda) and missing email-auth DNS records (SPF, DKIM, DMARC). Use when the user pastes a list of domains — bare, one-per-line, comma-separated, or a CSV column — with no other instruction, or asks to check domains for blacklisting, blocklists, missing records, SPF/DKIM/DMARC, or email deliverability health. Pure public DNS, no API keys, no cost.

9 stars 2 forksProductivity & Notes

Install

skills CLI (Claude Code, Cursor, Codex and more)

npx skills add yheshamx/domain-blacklist-DNS-check --skill domain-health-check

Manual install

git clone --depth 1 https://github.com/yheshamx/domain-blacklist-DNS-check.git /tmp/domain-blacklist-DNS-check
mkdir -p ~/.claude/skills
cp -r /tmp/domain-blacklist-DNS-check/. ~/.claude/skills/domain-health-check

Personal skills live in ~/.claude/skills. Use .claude/skills in a project folder to share a skill with your team.

From the SKILL.md

# Domain Health Check

Checks every domain against 3 domain-reputation blacklists and 3 IP-reputation blacklists, plus SPF, DKIM (12 common selectors), and DMARC — using only public DNS. Requires Node 18+ on PATH (if `node -v` fails, tell the user Node 18+ is required and stop).

## Workflow

1. **Extract domains** from whatever the user provided: bare list, comma/space separated, CSV column, URLs, or messy text. Take anything that looks like a domain. Don't ask for confirmation — just run. (The script itself also lowercases, strips `https://`/`www.`/paths, dedupes, and skips invalid tokens.)
2. **Get the script**: if a `check.mjs` file exists in the same directory as this SKILL.md, use it directly. Otherwise write the script below verbatim to a temp/scratchpad file named `check.mjs`. Do not modify it.
3. **Run it once** for the whole batch: `node check.mjs domain1.com domain2.com ...` — it prints JSON. For very large lists (300+), split into runs of ~250 and merge results. Expect roughly 10–30 s per 50 domains.
4. **Render the two tables** (format below) from the JSON. Never show raw JSON.

## Output format

Start with a one-line summary, worst news first, e.g.:
> **2 listed · 3 missing SPF · 1 no DKIM · 14 fully clean** — all 6 blocklists reachable ✓

If any zone in `zoneStatus` is not `"ok"`, say instead: "⚠ <zone> unreachable from this network — its column is inconclusive, not clean." If `skipped` is non-empty, add one line listing the skipped tokens.

Read the full skill on GitHub

Details

Skill name: domain-health-check
Repository: yheshamx/domain-blacklist-DNS-check
License: MIT
Repo updated: 13 July 2026

FAQ

What does the Domain Health Check skill do?

How do I install the Domain Health Check skill?

skills CLI (Claude Code, Cursor, Codex and more): npx skills add yheshamx/domain-blacklist-DNS-check --skill domain-health-check. Skills go in ~/.claude/skills (personal) or .claude/skills (project), and Claude loads them automatically when a task matches the description.

Is Domain Health Check popular?

It lives in yheshamx/domain-blacklist-DNS-check, which has 9 GitHub stars and 2 forks.

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