What is mailbox-mcp?
mailbox-mcp is a MCP server by arbengine that physical mail API for AI agents: send letters, certified mail, postcards and batch mailings with cost previews, approval controls, tracking and webhooks. It is listed under Communication and has 2 GitHub stars.
| Type | Mcp server |
|---|---|
| Author | arbengine |
| Repository | arbengine/mailbox-mcp |
| Popularity | 2 GitHub stars |
| Category | Communication |
| Security | Review before installing (72/100) |
| Rank | #2,772 of 4,418 MCP servers; #159 in Communication |
| License | MIT |
| Last commit | 2026-10-11 |
| Runs | Cloud service |
| Language | TypeScript |
Is mailbox-mcp safe to install?
mailbox-mcp scores 72/100 on the MCPMods security check: Review before installing. Things to review: sends your data to a cloud service; can take actions such as send, write or deploy. It passed 3 of 6 checks.
MCP server results come from listing signals: who publishes it, where your data goes and what it can do. The code itself is not scanned yet.
| Check | Result |
|---|---|
| Community-built server | Note |
| Sends your data to a cloud service | Review |
| No credentials mentioned | Pass |
| Can take actions such as send, write or deploy | Review |
| No code execution | Pass |
| Source on GitHub | Pass |
How do I install mailbox-mcp?
- Find the launch command. The README says how the server starts (npx, uvx, docker or a remote URL) and which API keys it needs.
https://github.com/arbengine/mailbox-mcp
- Add it to Claude Code. Replace the part after -- with the command from the README. Remote servers use --transport http with a URL.
claude mcp add mailbox-mcp -- <command from README> claude mcp add --transport http mailbox-mcp <server-url>
- Check it connected. This lists your MCP servers and their status.
claude mcp list
Or ask Claude to set it up
Paste this into Claude Code and it installs mailbox-mcp for you:
Add the "mailbox-mcp" MCP server from https://github.com/arbengine/mailbox-mcp to Claude Code. Read its README for the launch command and any API keys I need, run claude mcp add, then check that it connects.