Atomic Mail vs Userport

In-depth architectural comparison of the Atomic Mail and Userport MCP servers. Compare execution transports, security boundaries, tool capabilities, quality scores, and ready-to-paste client installation snippets for Claude, Cursor, Windsurf, and VS Code.

Which MCP Server Should You Choose?

Choose Atomic Mail when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Atomic Mail Details

U

Choose Userport when:

• You need dedicated capabilities in the Communication domain.
• You prefer local stdio subprocess transport architecture.
• Your security boundary fits: No auth required (Free / Open Source).

Explore Userport Details

Feature & Specification Comparison

Specification	Atomic Mail Communication	U Userport Communication
Summary	Programmable email inbox for AI agents — JMAP, PoW auth, stdio MCP server.	Read and answer support conversations, and run outbound email and chat sequences, from your AI.
Category & Scope	Communication	Communication
Quality signal

Tools & Capabilities Breakdown

Ready-to-Paste Client Configurations

Paste either (or both) of these JSON server blocks into your client config file (e.g. claude_desktop_config.json or ~/.cursor/mcp.json).

{
  "mcpServers": {
    "atomic-mail": {
      "command": "npx",
      "args": [
        "-y",
        "--package=@atomicmail/agent-skill-github",
        "atomicmail"
      ]
    }
  }
}

{
  "mcpServers": {
    "userport": {
      "command": "npx",
      "args": [
        "-y",
        "userport"
      ]
    }
  }
}

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