Envelope

Verified Integration

Author: @simply•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect Envelope to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "envelope": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-envelope"
      ],
      "env": {}
    }
  }
}

Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).

Architecture & Capabilities

System Overview

Empowers AI agents to send and receive emails through an open-source API, leveraging existing IMAP/SMTP mailboxes with built-in human approval gates and no per-message fees.

Indexed Date

7/22/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Envelope

Yes, Envelope is designed for 'Bring Your Own' (BYO) mailboxes. It integrates seamlessly with any existing IMAP/SMTP email provider (like Gmail, Fastmail, Migadu, etc.) by simply adding your credentials, with auto-discovery for settings.

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