Powerline Email Tools MCP MCP server

This official MCP server provides agents with access to Powerline's free email deliverability tools. It enables automated checking of SPF, DKIM, DMARC, BIMI, and MTA-STS records, blacklist reputation checks for IPs and domains, email header analysis, DMARC report parsing, spam word detection, and inbox rendering previews. All checks are available as JSON API endpoints without requiring an account or API key.

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 Powerline

MCP endpoint (Streamable HTTP)

https://powerline.ai/mcp

Vendor documentation

What you can do with it

Validate SPF, DKIM, DMARC, and BIMI records for a domain
Check sending IP and domain reputation against DNS blacklists
Analyze email headers and DMARC aggregate reports
Preview how HTML emails render in Gmail, Outlook, and Yahoo

Tools advertised by the last live check:

check_domain
check_record
check_blacklists
analyze_headers
check_spam_words

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 powerline-email-tools-mcp https://powerline.ai/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 powerline-email-tools-mcp --url https://powerline.ai/mcp

Cursor

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

Cursor configuration

{
  "mcpServers": {
    "powerline-email-tools-mcp": {
      "url": "https://powerline.ai/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": {
    "powerline-email-tools-mcp": {
      "type": "streamableHttp",
      "url": "https://powerline.ai/mcp",
      "disabled": false
    }
  }
}

VS Code

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

VS Code configuration

{
  "servers": {
    "powerline-email-tools-mcp": {
      "type": "http",
      "url": "https://powerline.ai/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 powerline-email-tools-mcp https://powerline.ai/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": {
    "powerline-email-tools-mcp": {
      "url": "https://powerline.ai/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": {
    "powerline-email-tools-mcp": {
      "serverUrl": "https://powerline.ai/mcp"
    }
  }
}

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