Mailbox is a Model Context Protocol (MCP) server: Physical mail API for AI agents. Send letters, certified mail. Sandbox + live keys via MCP. As an MCP server it plugs straight into AI assistants, exposing its functionality as tools the model can invoke on your behalf.
It's a hosted (remote) server — point your client at https://mailbox.bot/api/mcp and you're connected, with nothing to install locally. The current release is v1.0.1.
You'll find Mailbox in the AI & Agents category here on mcp.site; it connects to Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and any other MCP client — see the install snippets below. If you maintain Mailbox for mailbox.bot, claim this listing to verify ownership, earn the Verified badge, and keep the details current.
