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mcp/harbor
Grok

Plainmail for Grok

dev.plainmail/mail

Email on your own domains: add a domain, write its DNS, create mailboxes, read and send mail.

client:Grok transport:streamable-http

Install Plainmail in Grok

.mcp.json (in your project root) 

{
  "mcpServers": {
    "mail": {
      "type": "http",
      "url": "https://app.plainmail.dev/api/mcp/mcp"
    }
  }
}

Grok Build reads Claude Code's .mcp.json and Claude Desktop's config unchanged, so a server you have already set up there needs nothing new. The Grok web app and X integration do not take custom servers. Grok docs

Plainmail in other clients

Plainmail MCP server