Atomic Mail

Remote (streamable-http)

https://mcp.atomicmail.ai/mcp Requires auth (checked 2026-09-24)

Claude Code:

claude mcp add --transport http atomic-mail-agentic https://mcp.atomicmail.ai/mcp

Or add to your MCP client config:

{
  "mcpServers": {
    "atomic-mail-agentic": {
      "url": "https://mcp.atomicmail.ai/mcp"
    }
  }
}

Package (npm 0.3.27)

npx -y @atomicmail/mcp-modelcontextprotocol@0.3.27

Or add to your MCP client config:

{
  "mcpServers": {
    "atomic-mail-agentic": {
      "command": "npx",
      "args": [
        "-y",
        "@atomicmail/mcp-modelcontextprotocol@0.3.27"
      ],
      "env": {
        "ATOMIC_MAIL_CREDENTIALS_DIR": "<YOUR_VALUE>",
        "ATOMIC_MAIL_API_KEY": "<YOUR_VALUE>",
        "ATOMIC_MAIL_AUTH_URL": "<YOUR_VALUE>",
        "ATOMIC_MAIL_API_URL": "<YOUR_VALUE>",
        "ATOMIC_MAIL_INBOX_DOMAIN": "<YOUR_VALUE>"
      }
    }
  }
}

• ATOMIC_MAIL_CREDENTIALS_DIR — Override default credential directory (~/.atomicmail/)
• ATOMIC_MAIL_API_KEY secret — Existing API key — skips PoW registration
• ATOMIC_MAIL_AUTH_URL — Override auth service base URL
• ATOMIC_MAIL_API_URL — Override JMAP API base URL
• ATOMIC_MAIL_INBOX_DOMAIN — Default inbox domain when inboxId has no @ (default: atomicmail.ai)