Mailx Tools
@Mailwarm
About Mailx Tools
Email deliverability tools for AI agents. Check SPF, DKIM, DMARC, BIMI, blacklists, SMTP/IMAP connectivity, and generate DNS records.
Config
Add this server to your MCP-compatible client using the configuration below.
{
"mcpServers": {
"mailx": {
"url": "https://themailx.com/mcp"
}
}
}Tools
16Check if a domain has a valid SPF (Sender Policy Framework) DNS record. SPF specifies which mail servers are authorized to send email on behalf of a domain.
Check if a domain has a valid DKIM (DomainKeys Identified Mail) DNS record for a given selector. DKIM allows the receiver to verify that an email was sent by the domain owner.
Check if a domain has a valid DMARC (Domain-based Message Authentication, Reporting & Conformance) DNS record. DMARC tells receiving servers what to do with emails that fail SPF or DKIM checks.
Check if a domain has a valid BIMI (Brand Indicators for Message Identification) DNS record. BIMI allows brands to display their logo next to authenticated emails in supporting email clients.
Generate a DMARC DNS record for a domain. Returns the record name, value, and type ready to be added to DNS.
Generate an SPF DNS record for a domain based on the email provider being used. Returns the record name, value, and type ready to be added to DNS.
Test an SMTP server connection by attempting to connect and authenticate. If from_email and to_email are provided, the tool may attempt to send a test email. Only provide these fields if you are authorized to send from the account and intentionally want to test full sending capability.
Test an IMAP server connection by attempting to connect and authenticate. Use this to verify email receiving configuration.
Look up SMTP server settings (host, port, encryption) for a given email provider. Use this to find the correct SMTP configuration for services like Gmail, Outlook, SendGrid, etc.
Look up IMAP server settings (host, port, encryption) for a given email provider. Use this to find the correct IMAP configuration for services like Gmail, Outlook, Yahoo, etc.
Check if a domain or IP address is listed in popular email blacklists (DNSBLs). Being blacklisted can severely impact email deliverability.
Look up MX (Mail Exchanger) records for a domain. Returns the mail servers and their priorities.
Look up all TXT records for a domain. TXT records contain SPF policies, domain verification tokens, DKIM keys, and other metadata.
Look up CNAME (Canonical Name) records for a domain. Shows where a hostname aliases to.
Reverse DNS lookup. Find the hostname associated with an IP address. A valid PTR record is important for email sending reputation.
Look up all DNS records for a domain in one query. Returns A, AAAA, CNAME, MX, NS, TXT, and SOA records.
Overview
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.
Frequently asked questions
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.
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