---
title: "Inbox Checker Claude Skill: Is Your Domain Burned?"
description: "A Claude skill that tells you whether a sending domain is burned. Runs blacklist, SURBL, authentication, MX and domain age checks and returns one verdict."
url: https://warminboxes.com/skills/inbox-checker
breadcrumb: "Home > Claude Skills > Inbox Checker"
---
Claude skill

# Inbox Checker

Is this domain burned?

You reach for this when sending has already gone wrong: replies stopped, or mail started landing in spam, and you need to know whether the domain is recoverable or spent. It runs every reputation and authentication check at once and answers the question you actually asked before offering any advice about fixing it.

## What it runs

- **Blacklists** — Whether the domain or its IP is listed on the major blocklists

- **SURBL** — Whether the domain itself is flagged in message bodies, which survives changing servers

- **SPF, DKIM, DMARC** — Whether receivers can still verify you, and whether enforcement is on

- **MX** — Whether mail is still routed where you think it is

- **Nameservers** — Who controls DNS, and whether that changed

- **Registration age** — How much sending history the domain can plausibly have

- **Google hosting** — Whether the domain is tied to a Google Workspace account

## What you get back

- One verdict: burned, at risk, or clean

- The evidence behind it, with a link to re-run each check yourself

- If burned, the honest answer, which is that reputation attaches to the domain and the fix is a different one

- If at risk, the fixes in order of what each is costing you

## Install it

One file, from GitHub. It calls the free WarmInboxes API, so there is no key and nothing to sign up for.

 mkdir -p ~/.claude/skills/inbox-checker
curl -sL https://raw.githubusercontent.com/Huz-ai-fa/warminboxes-claude-skills/main/inbox-checker/SKILL.md -o ~/.claude/skills/inbox-checker/SKILL.md

[View it on GitHub →](https://github.com/Huz-ai-fa/warminboxes-claude-skills/tree/main/inbox-checker)

## Then just ask

You do not name the skill. Its description tells Claude when it applies.

- "Is acme.com safe to send from?"

- "My replies dropped off a cliff yesterday, check my sending domain"

- "I am taking over a client’s cold email setup, is this domain burned?"

Every answer cites the check behind it, so anything Claude tells you can be re-run by hand. A clean result is reported clean, with nothing to buy.

[All Claude skills →](https://warminboxes.com/skills)

## Do it by hand

The same checks as free tools in a browser.

- [Blacklist Checker](https://warminboxes.com/blacklist-checker)

- [SURBL Checker](https://warminboxes.com/surbl-checker)

- [Deliverability Checker](https://warminboxes.com/deliverability-checker)

## The other skills

One page each.

- [Domain Audit](https://warminboxes.com/skills/domain-audit) — Is this domain set up correctly to send from?

- [List Segmentation](https://warminboxes.com/skills/list-segmentation) — Who hosts the people on this list?

- [Infrastructure Planner](https://warminboxes.com/skills/infrastructure-planner) — How many mailboxes do I need, and what does it cost?