Physical mail API for AI agents. Send letters, certified mail. Sandbox + live keys via MCP. Connect the official Mailbox MCP server to Claude, ChatGPT, or Cursor through gate — one gateway URL, no config files, security-checked.
Free to start · No credit card · No hosting needed
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “get_mailbox”: Get your agent's real mailing address beta endpoint when the account has explicit beta access: street address + mailbox number for approved.”
“Use “get_usage”: Get usage summary, billing events, and prepaid credit balance for a time period. Returns itemized events (scans, forwards, mail sends) with.”
“Use “list_inbound_forwarding_addresses”: List the renter’s private inbound forwarding aliases on forward.mailbox.bot. These are the unique intake email addresses an operator, assist.”
“Use “list_inbound_mail”: List forwarded inbound mail items captured from private forwarding aliases. Default output includes compact draft_context so an LLM or exter.”
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Mailbox holds up.
Operated by Mailbox (mailbox.bot) at its documented MCP endpoint — not a third-party mirror or community re-host.
This server only exposes public data — no account and no credentials are involved when you connect.
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
If Mailbox adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Choose Mailbox in the gate directory. No sign-in needed.
Mailbox's tools are live in every AI client you've connected — with rules and logging built in.
Free to start · No credit card · No hosting needed
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
get_mailbox — Get your agent's real mailing address beta endpoint when the account has explicit beta access: street address + mailbox number for approved
get_usage — Get usage summary, billing events, and prepaid credit balance for a time period. Returns itemized events (scans, forwards, mail sends) with
list_inbound_forwarding_addresses — List the renter’s private inbound forwarding aliases on forward.mailbox.bot. These are the unique intake email addresses an operator, assist
list_inbound_mail — List forwarded inbound mail items captured from private forwarding aliases. Default output includes compact draft_context so an LLM or exter
get_inbound_mail — Get one forwarded inbound mail item with compact draft_context by default. Use this before drafting an outbound reply when you need sender c
list_postal_threads — List physical-mail threads that group inbound mail context, human review, and outbound sends. Use this to understand which inbound items and
get_postal_thread — Get one physical-mail thread with optional timeline events. Use this to explain how a generated outbound mail piece relates back to prior in
get_mailbox_md — Get the renter's MAILBOX.md standing instructions for this agent. Returns the full instruction text, version number, content hash, and last
+ 11 more tools once connected
https://mailbox.bot/api/mcpYes — Mailbox operates its own remote MCP server at mailbox.bot. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
Add gate's gateway URL to your AI client once, then pick Mailbox in the directory. No account or sign-in is needed. From then on, Mailbox's tools are available in every client you've connected to gate.
No. Mailbox runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
It's the vendor's official endpoint, and gate scans its tools for prompt injection and hidden instructions before it goes live, re-checks it whenever it changes, and lets you allow, block, or require approval for every single tool.
Yes — you can get started with gate for free and connect Mailbox in minutes. No credit card required.
Every server below works through the same gateway URL — connect once, add tools anytime.
Set up Mailbox in: Claude · Claude Code · ChatGPT · Cursor · VS Code