MailX MCP MCP server

An official MCP server by mailX that exposes email deliverability and DNS tools to AI agents. It allows agents to check SPF, DKIM, DMARC, and BIMI records, test SMTP/IMAP connectivity, check blacklists, and generate DNS records via a Streamable HTTP endpoint.

Endpoint and access

No sign-in: your client connects and lists tools immediately, with no account or key.

No sign-inEndpoint checked 2026-10-05Operated by mailX

MCP endpoint (Streamable HTTP)

https://themailx.com/mcp

Vendor documentation

What you can do with it

Check SPF, DKIM, DMARC, and BIMI authentication records for a domain
Test SMTP and IMAP server connectivity and configuration
Check if a domain or IP is listed on email blacklists
Generate DNS records like SPF or DMARC policies

Tools advertised by the last live check:

spf_check
dkim_check
dmarc_check
bimi_check
dmarc_generate
spf_generate
smtp_check
imap_check
smtp_finder
imap_finder
blacklist_check
mx_lookup
txt_lookup
cname_lookup
ptr_lookup
dns_lookup

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers a Streamable HTTP server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http mailx-mcp https://themailx.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add mailx-mcp --url https://themailx.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable mailx-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "mailx-mcp": {
      "url": "https://themailx.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure). The type must be streamableHttp for a remote HTTP server.

Cline configuration

{
  "mcpServers": {
    "mailx-mcp": {
      "type": "streamableHttp",
      "url": "https://themailx.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start mailx-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "mailx-mcp": {
      "type": "http",
      "url": "https://themailx.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http mailx-mcp https://themailx.com/mcp

Claude Desktop

Merge this into claude_desktop_config.json (macOS: ~/Library/Application Support/Claude/, Windows: %APPDATA%\Claude\), then restart Claude Desktop.

Claude Desktop configuration

{
  "mcpServers": {
    "mailx-mcp": {
      "url": "https://themailx.com/mcp"
    }
  }
}

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "mailx-mcp": {
      "serverUrl": "https://themailx.com/mcp"
    }
  }
}

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Do you run MailX MCP?

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