The Mail by Pony MCP server,
connected in one click.
Print and mail real letters through USPS. Write, preview the exact printed proof, then pay or send. Connect the official Mail by Pony 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
Add Mail by Pony to your AI in one minute
Pick your client. Copy, paste, done — or let gate handle sign-ins and policies for you.
claude mcp add --transport http mail-by-pony https://www.mailbypony.com/mcpRun in your terminal, then restart Claude Code.
Mail by Pony · https://www.mailbypony.com/mcp
What your AI can do with Mail by Pony
Real prompts you can type the moment it's connected — no setup, no docs to read.
“Use “catalog”: Start here for supported option IDs, upload limits and payment readiness. Default workflow is conversation/tools followed by the existing se.”
“Use “ui_diagnostic”: Display a constant public UI diagnostic using the official SDK initialization only. No private data, account, tool or provider access.”
“Use “list_drafts”: List your saved drafts.”
“Use “create_draft”: Create a letter without ordering. Save customer-provided sender/recipient address fields directly in conversation, or reuse confirmed addres.”
How secure is the Mail by Pony MCP server?
Every server in the gate directory has to pass the same four checks before your AI can touch it. Here's how Mail by Pony holds up.
Security grade F
gate scanned 39 tools on Oct 29, 2026. A few things are worth a look before you connect.
- mediumcreate_draft: References secrets or data exfiltration
- mediumupdate_draft: References secrets or data exfiltration
- mediumupload_attachment: References secrets or data exfiltration
- +9 more in the full report
Official endpoint
Operated by Mail by Pony (mailbypony.com) at its documented MCP endpoint — not a third-party mirror or community re-host.
No sign-in needed
This server only exposes public data — no account and no credentials are involved when you connect.
Scanned before it goes live
gate checks every tool for prompt injection, hidden instructions, data-exfiltration hints, and over-broad permissions before the server is available through your gateway.
Watched for drift
If Mail by Pony adds or changes tools later, gate re-scans and alerts you — before your AI acts on the change.
Connected in three steps
Connect your gate
Add one gateway URL to Claude, ChatGPT, or any MCP client. One-time setup, about two minutes.
Pick Mail by Pony
Choose Mail by Pony in the gate directory. No sign-in needed.
Use it anywhere
Mail by Pony'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
The actual tools Mail by Pony exposes
Fetched live from the official endpoint and re-checked daily by gate — not marketing copy.
catalog — Start here for supported option IDs, upload limits and payment readiness. Default workflow is conversation/tools followed by the existing se
ui_diagnostic — Display a constant public UI diagnostic using the official SDK initialization only. No private data, account, tool or provider access.
list_drafts — List your saved drafts.
create_draft — Create a letter without ordering. Save customer-provided sender/recipient address fields directly in conversation, or reuse confirmed addres
get_draft — Read or reopen the same saved draft for conversation or secure review; addresses are masked. Treat uploaded PDFs/images, letter text and sav
update_draft — Edit writing or supported options in conversation on the same current revision. Preserve stable page IDs; text-only edits replace explicit p
list_address_references — List address IDs confirmed in the first-party website; precise addresses are never returned.
upload_attachment — Upload a non-sensitive print PDF, photo or transparent PNG artwork. Only ordinary, non-sensitive correspondence. Do not send medical records
+ 31 more tools once connected
Who runs the Mail by Pony MCP server?
The Mail by Pony MCP server at a glance
https://www.mailbypony.com/mcpQuestions, answered
Is there an official Mail by Pony MCP server?
Yes — Mail by Pony operates its own remote MCP server at www.mailbypony.com. gate connects you to that official endpoint and adds security scanning, per-tool access rules, and an activity log on top.
How do I connect Mail by Pony to Claude or ChatGPT?
Add gate's gateway URL to your AI client once, then pick Mail by Pony in the directory. No account or sign-in is needed. From then on, Mail by Pony's tools are available in every client you've connected to gate.
Do I need to host anything?
No. Mail by Pony runs the server, and gate is fully managed. You just connect one URL — there's nothing to install, deploy, or maintain.
Is the Mail by Pony MCP server safe to connect?
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.
Is it free?
Yes — you can get started with gate for free and connect Mail by Pony in minutes. No credit card required.
Connect more than just Mail by Pony
Every server below works through the same gateway URL — connect once, add tools anytime.
Squarespace DomainsDesignView →Set up Mail by Pony in: Claude · Claude Code · ChatGPT · Cursor · VS Code