Sendmux Email Inbox API + Sending MCP Server

Name: Sendmux Email Inbox API + Sending MCP Server
Author: io.github.Sendmux

io.github.Sendmux/sendmux-mcp

Repository Registry

What is the Sendmux Email Inbox API + Sending MCP server?

Email inbox API for AI agents with MCP tools for Mailbox, Management, and Sending APIs.

How to install Sendmux Email Inbox API + Sending

Copy-paste configuration for popular MCP clients.

transport: stdio

Config generated by PluginBench — verify against the source before use.

Environment / auth

SENDMUX_MCP_SURFACES
required
Tool surfaces to run locally.
SENDMUX_MAILBOX_API_KEY
required
secret
Mailbox API key for Mailbox API and Sending API tools.
SENDMUX_MANAGEMENT_API_KEY
required
secret
Root API key for Management API tools.
SENDMUX_SENDING_API_KEY
secret
Optional Sending API key when it differs from the Mailbox API key.

Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<YOUR_SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<YOUR_SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<YOUR_SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<YOUR_SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Cursor

~/.cursor/mcp.json

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<YOUR_SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<YOUR_SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<YOUR_SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<YOUR_SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Windsurf

~/.codeium/windsurf/mcp_config.json

{
  "mcpServers": {
    "sendmux-mcp": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<YOUR_SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<YOUR_SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<YOUR_SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<YOUR_SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

VS Code

.vscode/mcp.json

{
  "servers": {
    "sendmux-mcp": {
      "type": "stdio",
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<YOUR_SENDMUX_MCP_SURFACES>",
        "SENDMUX_MAILBOX_API_KEY": "<YOUR_SENDMUX_MAILBOX_API_KEY>",
        "SENDMUX_MANAGEMENT_API_KEY": "<YOUR_SENDMUX_MANAGEMENT_API_KEY>",
        "SENDMUX_SENDING_API_KEY": "<YOUR_SENDMUX_SENDING_API_KEY>"
      }
    }
  }
}

Claude Code

claude mcp add sendmux-mcp --env SENDMUX_MCP_SURFACES=<YOUR_SENDMUX_MCP_SURFACES> --env SENDMUX_MAILBOX_API_KEY=<YOUR_SENDMUX_MAILBOX_API_KEY> --env SENDMUX_MANAGEMENT_API_KEY=<YOUR_SENDMUX_MANAGEMENT_API_KEY> --env SENDMUX_SENDING_API_KEY=<YOUR_SENDMUX_SENDING_API_KEY> -- uvx sendmux-mcp