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Paid email, DNS, mail-security and RDAP intelligence for agents over x402.
Streamable HTTP
https://email-dns-preflight-x402.copper-crate.workers.dev/mcpclaude mcp add --transport http email-dns-preflight-x402 https://email-dns-preflight-x402.copper-crate.workers.dev/mcpThis server publishes no installable package.