InboxGuards MCP

An official MCP server for InboxGuards that allows agents to validate email addresses for syntax and deliverability risks, and generate specific SPF, DKIM, and DMARC security fix plans for domains. It integrates x402 payment flows for paid tools while offering free validation utilities.

Endpoint and access

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

No sign-inEndpoint checked 2026-10-19Operated by InboxGuards

MCP endpoint (Streamable HTTP)

https://api.inboxguardstest.com/mcp

Vendor documentation

What you can do with it

Validate email syntax and MX records
Check for disposable or role-based emails
Generate SPF/DKIM/DMARC fix plans
Assess email deliverability security

Tools advertised by the last live check:

validate_email
pricing
check_email_address
email_fix_plan

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 inboxguards-mcp https://api.inboxguardstest.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 inboxguards-mcp --url https://api.inboxguardstest.com/mcp

Cursor

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

Cursor configuration

{
  "mcpServers": {
    "inboxguards-mcp": {
      "url": "https://api.inboxguardstest.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": {
    "inboxguards-mcp": {
      "type": "streamableHttp",
      "url": "https://api.inboxguardstest.com/mcp",
      "disabled": false
    }
  }
}

VS Code

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

VS Code configuration

{
  "servers": {
    "inboxguards-mcp": {
      "type": "http",
      "url": "https://api.inboxguardstest.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 inboxguards-mcp https://api.inboxguardstest.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": {
    "inboxguards-mcp": {
      "url": "https://api.inboxguardstest.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": {
    "inboxguards-mcp": {
      "serverUrl": "https://api.inboxguardstest.com/mcp"
    }
  }
}

Ground your agent in cited data

InboxGuards MCP gives your agent tools. Koskamo gives it reviewed, cited facts to check its answers against. Add it as a second MCP server; public reads need no API key.

Connect Koskamo Browse datasets

See all 1,282

Do you run InboxGuards MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing