---
title: "Cold Email Copy Claude Skill: Pre-Send Spam Check"
description: "A Claude skill that checks cold email copy before it sends: spam triggers, links, tracking, Gmail clipping, spintax, merge tags and the opt-out line."
url: https://warminboxes.com/skills/cold-email-copy
breadcrumb: "Home > Claude Skills > Cold Email Copy"
---
Claude skill

# Cold Email Copy

Is this email going to land in spam?

The quickest way we see a domain burn is recipients marking mail as spam, and warmup, DNS and rotation do not outrun it. So copy gets checked before infrastructure, and a domain that passes every check with a campaign in spam is usually a copy or list problem. Paste the email or the sequence and this says which lines to change, most costly first.

## What it runs

- **Spam triggers and structure** — Words, tone and layout that filters and readers both react to

- **Links, images and tracking** — What a link or pixel costs, and whether the tracking domain is set up right

- **Gmail clipping** — HTML size, so the end of the email and the opt-out are not cut off

- **Spintax and merge tags** — Every variant rendered, so no one receives a blank first name

- **Inbox preview** — How the subject and opener actually show before the email is opened

- **Opt-out** — A reply-based line or one-click unsubscribe, depending on who you send to

## What you get back

- What each check found, with a link to re-run it

- The two or three edits that matter most, line by line, without rewriting the email unasked

- Whether it is ready to test at 5 a day per inbox, the pace any new copy starts at

- No placement promise: receivers decide, and no check can guarantee the inbox

## Install it

Best installed with the plugin, which also connects WarmInboxes Free MCP, the tools this skill runs. On its own it is one file that falls back to the free WarmInboxes API, so there is no key and nothing to sign up for.

 /plugin marketplace add Huz-ai-fa/warminboxes-claude-skills
/plugin install warminboxes@warminboxes

Or this one skill on its own:

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

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

## Then just ask

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

- "Is this cold email spammy?"

- "Check my sequence before I launch it tomorrow"

- "My domain checks pass but the new campaign is landing in spam, why?"

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.

- [Spam Word Checker](https://warminboxes.com/spam-checker)

- [Pre-Send Checker](https://warminboxes.com/pre-send-checker)

- [Inbox Previewer](https://warminboxes.com/inbox-previewer)

- [Spintax Tester](https://warminboxes.com/spintax-tester)

## The other skills

One page each.

- [Inbox Checker](https://warminboxes.com/skills/inbox-checker) — Is this domain burned?

- [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?

- [Bounce Diagnosis](https://warminboxes.com/skills/bounce-diagnosis) — What do these bounces mean, and is it the list or me?

- [Lead Lists](https://warminboxes.com/skills/lead-lists) — Is this list ready to send to?

- [Warm Rotation](https://warminboxes.com/skills/warm-rotation) — How do I make my inboxes last longer?

- [Cold Email Playbook](https://warminboxes.com/skills/cold-email-playbook) — Why did my replies drop, and what do I do?

- [Infrastructure API](https://warminboxes.com/skills/infrastructure-api) — How do I connect my WarmInboxes account to Claude?