Mailx Tools

What is Mailx Tools?

Mailx Tools is an MCP server that provides AI agents with skills to diagnose and fix email deliverability issues. It integrates with the MailX platform and offers tools for checking SPF, DKIM, DMARC, BIMI records, blacklist status, and SMTP/IMAP server connectivity.

How to use Mailx Tools?

Install the mailx-skills plugin in Claude Code with /plugin marketplace add Mailwarm/mailx-skills then /plugin install email-deliverability@mailx-skills. For Claude.ai, download the SKILL.md file and upload it under Settings → Skills. You must also configure the MailX MCP server endpoint (https://tools.themailx.com/mcp) in your MCP client.

Key features of Mailx Tools

• Audit domain email deliverability in one command
• Generate ready-to-paste SPF and DMARC DNS records
• Diagnose mail server issues using SMTP/IMAP credentials
• Look up provider settings for Gmail, Outlook, SendGrid, etc.
• Checks blacklists and BIMI records automatically

Use cases of Mailx Tools

• Diagnosing why emails go to spam and fixing authentication records
• Setting up SPF, DKIM, DMARC, and BIMI for a new domain
• Troubleshooting mail server connectivity problems
• Consulting SMTP/IMAP configuration for common email providers

FAQ from Mailx Tools

What is a "Skill" and how does it work?

A Skill is a SKILL.md file with workflow instructions that an AI agent loads on demand. The format is an open standard adopted by Anthropic and OpenAI.

What runtime does Mailx Tools require?

The skill requires the MailX MCP server to be installed and configured in the MCP client (e.g., Claude Desktop, Cursor, or Claude Code). The MCP server is an HTTP endpoint at https://tools.themailx.com/mcp.

How do I install the email-deliverability skill?

In Claude Code, use the plugin marketplace commands. For Claude.ai, download the SKILL.md from the repository and upload it in Settings → Skills. For the API, use the POST /v1/skills endpoint.

Where does the SKILL.md content come from?

The current SKILL.md is dynamically generated from the live MailX tool catalog hosted at tools.themailx.com/skills/email-deliverability/SKILL.md.

What transports and authentication does the MCP server use?

The MailX MCP server uses HTTP as its transport. No authentication details are specified in the README.