MailStream for Windsurf

app.mailstream/mailstream

The first MCP server for physical mail: send postcards and letters, manage lists and campaigns.

client:Windsurf transport:streamable-http

Install MailStream in Windsurf

~/.codeium/windsurf/mcp_config.json · windows: %USERPROFILE%\.codeium\windsurf\mcp_config.json

{
  "mcpServers": {
    "mailstream": {
      "serverUrl": "https://my.mailstream.app/mcp"
    }
  }
}

Global only — Windsurf has no per-project MCP config. Refresh Cascade after saving. Windsurf docs