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Deliverability Checker

Checked
guia-matthieu·vlatest·other·MIT

This tool analyzes your email content to identify potential deliverability issues and improve your sender reputation for better inbox placement.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add guia-matthieu/clawfu-skills --skill deliverability-checker -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

guia-matthieu

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned guia-matthieu/clawfu-skills at 4108f5c010.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
4108f5c010
Manifest
skills/email-tools/deliverability-checker/SKILL.md
Scanned
3 files, 551 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

The deliverability checker skill analyzes email content and provides feedback to improve its chances of reaching recipients' inboxes. It assesses factors like spam score, sender reputation, and authentication records (SPF, DKIM, DMARC). The goal is to help users avoid common pitfalls that lead to emails being marked as spam or blocked entirely.

When to use it

  • Pre-send email campaigns: Evaluate marketing emails before deployment to identify potential deliverability issues.
  • Troubleshooting low inbox placement rates: Diagnose why emails aren't reaching recipients and receive suggestions for improvement.
  • Checking transactional emails: Ensure critical notifications (password resets, order confirmations) consistently reach users.
  • Auditing email templates: Regularly review email designs and content to maintain a positive sender reputation.

Key capabilities

  • Spam score analysis
  • Sender reputation assessment
  • SPF record verification
  • DKIM record validation
  • DMARC record check

Example prompts

  • "Check the deliverability of this email: [paste email content]"
  • "What's the spam score for this subject line: 'Limited Time Offer!'"
  • "Analyze my sender reputation and suggest improvements."

Tips & gotchas

The skill’s effectiveness depends on accurate input; ensure you provide complete email content or relevant details about your sending infrastructure. Results are indicative, not guarantees of deliverability – external factors can still impact inbox placement.