3LT Letter Mail MCP Server

by 3lgrouptechnology Your server? Claim it

answering

3LT Letter Mail is answering right now. Last checked 12 min ago. It exposes 3 tools. Last commit 3 Oct 2026.

Give AI assistants hands: send real USPS letters via MCP.

Uptime history 9 days of history · worst day 99%

9 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

108 ms

Response time

average over 24h

Stars

last commit 3 Oct 2026

What the code does

We read the source, 6 d ago · tools taken from the live server · rules ccca72095570

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable core.py:119

    draft_dir = os.path.join(UPLOADS_DIR, f"draft_{draft_id}")

Page loads a third-party script dashboard/billing.html:26, dashboard/connect.html:29

<script src="https://js.stripe.com/v3/"></script>

Page executes code built at runtime dashboard/customer.html:166, dashboard/index.html:82

  tb.innerHTML = sends.length ? '' :

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 12 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add 3lt-letter-mail --transport http https://3lgrouptechnology.com/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "3lt-letter-mail": {
      "url": "https://3lgrouptechnology.com/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.3lt-letter-mail]
url = "https://3lgrouptechnology.com/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "3lt-letter-mail": {
      "url": "https://3lgrouptechnology.com/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "3lt-letter-mail": {
      "url": "https://3lgrouptechnology.com/mcp"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

draft

draft_letter

Create a letter DRAFT: verifies the recipient address with PostGrid, screens content, and returns a price quote. This NEVER mails anything. Pass EITHER html (letter body as an HTML string) OR pdf_path (path to a PDF file on the server). PDF text is extracted for screening; if extraction fails the draft is kept but flagged needs_review.

request

request_send

Request that a draft be mailed. approval-tier keys: creates a PENDING request and returns a one-tap Allow/Deny approval_url for the human. Nothing is mailed until Allow. on_command keys: may auto-send inside guardrails (spend caps, content screening, anomaly detection); anything outside them stays PENDING.

send

send_status

Check a send request: status (PENDING/SENT/REJECTED/FAILED), the key's trust tier and tier decision, approval state (+approval_url while pending), and billing state (Stripe charge id when billed).

Endpoints

URL	Transport	State	Latency	Checked
https://3lgrouptechnology.com/mcp	streamable-http	answering	141 ms	12 min ago

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3LT Letter Mail — questions

Answers built from our own checks of this server.

What can 3LT Letter Mail do?

It exposes 3 tools, read directly from the server on our last check. Among them: draft_letter, request_send, send_status. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is 3LT Letter Mail working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 108 ms. The bar chart above shows every period we have measured.

How do I connect 3LT Letter Mail?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does 3LT Letter Mail need an API key?

No. 3LT Letter Mail completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is 3LT Letter Mail?

It answers our handshake in 108 ms on average, which is faster than 82% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is 3LT Letter Mail open source?

We cannot say either way: written in Python and 0 stars on GitHub, but we could not determine the licence, and without one the code is not open source by default.