Koskamo

HostSherlock MCP

This MCP server allows AI assistants to check SPF, DKIM, DMARC, and MX records for any domain, read DMARC reports to identify failing services, and monitor DNS changes. It enables agents to verify email infrastructure security and provide step-by-step fixes for domain authentication failures.

Visit HostSherlock

Endpoint and access

OAuth sign-in: the first time you connect, your client opens the vendor's own authorization prompt in a browser.

HostSherlock MCP logo, by HostSherlockVendor evidenceStreamable HTTPOAuth sign-inEndpoint checked 2026-11-09Operated by HostSherlock
You need:sign in, or create an account, and allow the assistantCreate a free account
MCP endpoint (Streamable HTTP)
https://api.emailsherlock.com/v1/mcp
Vendor documentation

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Passed Official MCP Registry namespace is tied to hostsherlock.com ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Check SPF, DKIM, DMARC and MX of any domain
  • Read DMARC reports to identify failing services
  • Monitor DNS changes for a domain
  • Verify email infrastructure security

Source and maintenance

Vendor evidenceRegistry 1.0.0
mcp-registry: com.hostsherlock/mcp@1.0.0Project website

Tools

Reported by the attributed source; not independently observed by Koskamo.

No tool definitions available.

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks
1 of 1 (100%)
Average latency
449 ms
95th percentile latency
449 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

  • · probe · passed · 449 ms · metadata changed · refuses unauthenticated initialize (HTTP 401)

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 the remote server. Use --scope project to write .mcp.json for the repo.
Claude Code configuration
claude mcp add --transport http hostsherlock-mcp https://api.emailsherlock.com/v1/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 hostsherlock-mcp --url https://api.emailsherlock.com/v1/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable hostsherlock-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "hostsherlock-mcp": {
      "url": "https://api.emailsherlock.com/v1/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "hostsherlock-mcp": {
      "type": "streamableHttp",
      "url": "https://api.emailsherlock.com/v1/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start hostsherlock-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "hostsherlock-mcp": {
      "type": "http",
      "url": "https://api.emailsherlock.com/v1/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 hostsherlock-mcp https://api.emailsherlock.com/v1/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.
Claude Desktop configuration
https://api.emailsherlock.com/v1/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": {
    "hostsherlock-mcp": {
      "serverUrl": "https://api.emailsherlock.com/v1/mcp"
    }
  }
}

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Do you run HostSherlock 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.

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