Postbox Services Email Deliverability MCP MCP server

An official MCP server by Postbox Consultancy Services that provides AI assistants with live email deliverability and security tools. It enables agents to perform real-time checks against 24 blacklists, verify DNS records (MX, SPF, DKIM, DMARC), analyze SMTP responses, check for spoofing/BEC risks, and trace URL redirects, ensuring ground-truth data rather than AI hallucination.

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 Postbox Consultancy Services

MCP endpoint (Streamable HTTP)

https://mcp.postboxservices.com/mcp

Vendor documentation

What you can do with it

Check if a domain is listed on email blacklists
Verify DNS records like SPF, DKIM, and DMARC
Analyze email spoofing and BEC risks
Trace the final destination of shortened URLs

Tools advertised by the last live check:

check_blacklist
check_spoofability
trace_redirect
create_mailtest
get_mailtest_result
analyze_eml
get_domain_age
whois_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 postbox-services-email-deliverability-mcp https://mcp.postboxservices.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 postbox-services-email-deliverability-mcp --url https://mcp.postboxservices.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable postbox-services-email-deliverability-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "postbox-services-email-deliverability-mcp": {
      "url": "https://mcp.postboxservices.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": {
    "postbox-services-email-deliverability-mcp": {
      "type": "streamableHttp",
      "url": "https://mcp.postboxservices.com/mcp",
      "disabled": false
    }
  }
}

VS Code

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

VS Code configuration

{
  "servers": {
    "postbox-services-email-deliverability-mcp": {
      "type": "http",
      "url": "https://mcp.postboxservices.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 postbox-services-email-deliverability-mcp https://mcp.postboxservices.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": {
    "postbox-services-email-deliverability-mcp": {
      "url": "https://mcp.postboxservices.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": {
    "postbox-services-email-deliverability-mcp": {
      "serverUrl": "https://mcp.postboxservices.com/mcp"
    }
  }
}

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