Koskamo

Email DNS Preflight MCP

Provides read-only MCP tools for email validation, DNS lookup, domain security posture analysis, and RDAP domain intelligence. It enables agents to perform sender vetting, CRM hygiene, and anti-phishing preflight checks using direct Base USDC payments without API keys.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Email DNS Preflight MCP logo, by x402Community listingStreamable HTTPNo sign-inEndpoint checked 2026-11-06Published by x402
You need:Direct Base x402 needs no signup or API keyAuthorization: Bearer or X-Credit-Key
MCP endpoint (Streamable HTTP)
https://email-dns-preflight-x402.copper-crate.workers.dev/mcp
Vendor documentation

What its tools do

4 tools, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (4)

4 of 4 have a description · 4 of 4 declare behavior hints · 0 of 4 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

  • Passed Endpoint answered the live check ·
  • Availability 1 of 1 checks passed in 30 days

What you can do with it

  • Validate email syntax and provider classification
  • Check DNS security posture including SPF and DMARC
  • Retrieve domain registration age and registrar details
  • Analyze email security diagnostics for phishing prevention

Source and maintenance

Community listingRegistry 1.1.0
mcp-registry: io.github.rosarioV25/email-dns-preflight-x402@1.1.0Project website

Protocol and capabilities

Server
email-dns-preflight-x402 1.1.0
MCP protocol negotiated in check
2025-11-25
Tools
4 advertised
Resources
Not advertised
Resource templates
Not advertised
Prompts
Not advertised
Server-advertised capabilities
{
  "tools": {
    "listChanged": true
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Four read-only infrastructure-intelligence tools are available. Every tool call costs $0.001 native USDC on Base through x402. Tool discovery and protocol negotiation are free. Results are DNS/RDAP posture signals and do not claim mailbox existence, inbox delivery, identity or reputation.

Tools

4 advertised

email_preflight — Email DNS Preflight
Advertised by the server during the last successful anonymous check.
Advertised read-only

Validate practical email syntax and inspect DNS, mail routing, authentication and domain-security posture. DNS-level only; no SMTP mailbox-existence claim. Costs $0.001 native USDC on Base.

email_preflight input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "email"
  ],
  "properties": {
    "email": {
      "type": "string",
      "maxLength": 254,
      "minLength": 3
    }
  }
}
email_preflight annotations
{
  "readOnlyHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
domain_preflight — Domain DNS Preflight
Advertised by the server during the last successful anonymous check.
Advertised read-only

Inspect DNS records, CAA, SPF/DMARC/DKIM/BIMI, DNSSEC, RDAP age/expiry, registrar-lock and nameserver-redundancy posture. Costs $0.001 native USDC on Base.

domain_preflight input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "maxLength": 253,
      "minLength": 1
    }
  }
}
domain_preflight annotations
{
  "readOnlyHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
domain_email_security — Domain Email Security
Advertised by the server during the last successful anonymous check.
Advertised read-only

Focused SPF/DMARC/DKIM/BIMI diagnostics with bounded recursive SPF lookup analysis, CAA/DNSSEC context and deterministic fixes. Costs $0.001 native USDC on Base.

domain_email_security input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "maxLength": 253,
      "minLength": 1
    }
  }
}
domain_email_security annotations
{
  "readOnlyHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}
domain_rdap — Domain Age and RDAP
Advertised by the server during the last successful anonymous check.
Advertised read-only

Privacy-safe RDAP/WHOIS-successor lookup for domain age, expiry, registrar, statuses, nameservers and DNSSEC delegation. Costs $0.001 native USDC on Base.

domain_rdap input schema
{
  "type": "object",
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "maxLength": 253,
      "minLength": 1
    }
  }
}
domain_rdap annotations
{
  "readOnlyHint": true,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

  1. 2026-11-07: 1 of 1 checks answered

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
460 ms
95th percentile latency
460 ms

Maintenance history

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

  • · probe · passed · 460 ms · metadata changed · 4 tool(s)

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 email-dns-preflight-mcp https://email-dns-preflight-x402.copper-crate.workers.dev/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 email-dns-preflight-mcp --url https://email-dns-preflight-x402.copper-crate.workers.dev/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable email-dns-preflight-mcp in your MCP settings.
Cursor configuration
{
  "mcpServers": {
    "email-dns-preflight-mcp": {
      "url": "https://email-dns-preflight-x402.copper-crate.workers.dev/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).
Cline configuration
{
  "mcpServers": {
    "email-dns-preflight-mcp": {
      "type": "streamableHttp",
      "url": "https://email-dns-preflight-x402.copper-crate.workers.dev/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start email-dns-preflight-mcp and inspect its tools.
VS Code configuration
{
  "servers": {
    "email-dns-preflight-mcp": {
      "type": "http",
      "url": "https://email-dns-preflight-x402.copper-crate.workers.dev/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 email-dns-preflight-mcp https://email-dns-preflight-x402.copper-crate.workers.dev/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://email-dns-preflight-x402.copper-crate.workers.dev/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": {
    "email-dns-preflight-mcp": {
      "serverUrl": "https://email-dns-preflight-x402.copper-crate.workers.dev/mcp"
    }
  }
}

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