Courier vs Proton Mail MCP

In-depth architectural comparison of the Courier and Proton Mail MCP 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 Courier 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 Courier Details

Choose Proton Mail MCP 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 Proton Mail MCP Details

Feature & Specification Comparison

Specification	Courier Communication	Proton Mail MCP Communication
Summary	Continuity protocol for autonomous AI agents. Agent messaging with SMTP bridge and LN payments.	Proton Mail MCP via Bridge (IMAP/SMTP) · 13 tools · dual transport stdio + HTTP.
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": {
    "courier": {
      "command": "npx",
      "args": [
        "-y",
        "courier-mcp"
      ]
    }
  }
}

{
  "mcpServers": {
    "proton-mail-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "@alexendros/protonsuite-agent"
      ]
    }
  }
}

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