Email Inbox API + Sending by Sendmux

Remote (streamable-http)

https://mcp.sendmux.ai/mcp Requires auth (checked 2026-09-24)

Claude Code:

claude mcp add --transport http sendmux-sdk https://mcp.sendmux.ai/mcp

Or add to your MCP client config:

{
  "mcpServers": {
    "sendmux-sdk": {
      "url": "https://mcp.sendmux.ai/mcp"
    }
  }
}

Package (pypi 2.1.3)

uvx sendmux-mcp

Or add to your MCP client config:

{
  "mcpServers": {
    "sendmux-sdk": {
      "command": "uvx",
      "args": [
        "sendmux-mcp"
      ],
      "env": {
        "SENDMUX_MCP_SURFACES": "<YOUR_VALUE>",
        "SENDMUX_MAILBOX_API_KEY": "<YOUR_VALUE>",
        "SENDMUX_MANAGEMENT_API_KEY": "<YOUR_VALUE>",
        "SENDMUX_SENDING_API_KEY": "<YOUR_VALUE>"
      }
    }
  }
}

• 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 send-capable smx_mbx_ key or owner-approved smx_agent_ token for Sending API tools when it differs from the Mailbox API key.