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Lettr

Verified Integration
Author: @lettr-com•Category: ServerApplication
GitHub Repository
JSON-RPC 2.0
Protocol Standard
Sub-second
Execution Latency
Active
Operational Status
Tags:#Claude#Search#Database#API#Git#AI#GitHub#Node.js

Client Configuration

— Connect Lettr to Claude Desktop or Cursor in seconds
{
  "mcpServers": {
    "lettr": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-lettr"
      ],
      "env": {}
    }
  }
}
Paste into ~/Library/Application Support/Claude/claude_desktop_config.json (macOS) or %APPDATA%\Claude\claude_desktop_config.json (Windows).
Architecture & Capabilities

System Overview

Integrate Lettr's email API directly into Model Context Protocol (MCP) clients for seamless transactional email sending and template management.

Indexed Date

7/23/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for Lettr

Lettr is an email API platform for developers, enabling seamless transactional email sending and template management. It integrates directly into Model Context Protocol (MCP) clients like Claude Code, Cursor, and Claude Desktop, allowing you to manage email tasks within your development environment.

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