163 Mail

Verified Integration

Author: @spawning•Category: ServerApplication

GitHub Repository

JSON-RPC 2.0

Protocol Standard

Sub-second

Execution Latency

Active

Operational Status

Client Configuration

— Connect 163 Mail to Claude Desktop or Cursor in seconds

{
  "mcpServers": {
    "163-mail": {
      "command": "npx",
      "args": [
        "-y",
        "@modelcontextprotocol/server-163-mail"
      ],
      "env": {}
    }
  }
}

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

Architecture & Capabilities

System Overview

Automates sending emails through the 163 web interface, specifically addressing the challenge of sending large attachments without SMTP.

Indexed Date

7/21/2026

License

Open Source

Protocol Layer

stdio / SSE RPC

Frequently Asked Questions

Architecture and operational details for 163 Mail

It directly interacts with the 163 mail web interface to upload local files. It supports up to 5 attachments, with each individual file capable of being up to 500MB, effectively bypassing typical SMTP attachment size limitations.

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