Individual skill

cold-email-domain-check

Check whether a cold email sending domain is set up correctly. Scores MX, SPF, DKIM, DMARC, domain age, website and Spamhaus DBL status out of 100 and lists what to fix first. Use when someone asks if a domain is ready for cold email, why their emails land in spam, or wants to audit several sending domains.

skills/cold-email-domain-check/SKILL.md

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Last checked: Nov 6, 2026

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Repository stars (not skill ratings): 1
Repository last updated: Sep 29, 2026
License: MIT

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agent-skills Repository topic
b2b Repository topic
claude-code Repository topic
claude-code-plugin Repository topic
claude-skills Repository topic
cold-email Repository topic
email-deliverability Repository topic
gtm Repository topic
lead-generation Repository topic
sales Repository topic
security Derived category

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SKILL.mdcore · 3,310 bytes
SKILL.mdcore · 3,310 bytes
scripts/check_domain.pyruns · 11,165 bytes

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# Cold email domain check

A free diagnostic from [Growth Cab](https://www.growthcab.com). It reads the public DNS of a sending domain and tells you what is missing or misconfigured. It finds problems. It does not change anything.

## How to run it

1. Collect the domains to check. If the user gives email addresses, keep only the part after `@`. Drop `www.` and any path.
2. Run the script from this skill's folder:

   ```bash
   python3 scripts/check_domain.py domain1.com domain2.com
   ```

   Add `--selector NAME` when the user knows their DKIM selector (repeatable). Add `--json` for machine-readable output. The script needs Python 3.9+ and internet access, and uses the standard library only.