# 3LT Letter Mail

Lets an AI assistant mail physical letters through USPS and send faxes. Useful when a document has to arrive on paper.

- MCP server · `type=mcp` · Claude Code, Codex, Cursor, GitHub Copilot, Windsurf (Devin Desktop), Cline, Zed, Gemini CLI
- Author: 3LGroupTechnology
- License: not stated · policy=link-only · description only; the file stays with the author
- Source: https://github.com/3LGroupTechnology/3lt-letter-mail
- Updated: 2026-10-19
- HTML: https://affpapa.org/en/nevibecode/mcp/3lt-letter-mail

## What it does

Seven tools come with the server. `draft_letter` verifies the recipient address, screens the content and returns a quote, mailing nothing. `request_send` files the send request, and `send_status` reports where it stands: `PENDING`, `SENT`, `REJECTED` or `FAILED`. Faxes take more steps — `create_fax_draft` validates the number, counts pages and quotes, `approve_fax` clears it, `send_fax` transmits through Phaxio, `get_fax_status` tracks delivery.

No tool mails or faxes on its own. Every send carries an approval record: a human tap, or a trusted `on_command` key auto-sending inside guardrails. Faxes are stricter — `approve_fax` is required every time, with no zero-prompt path even for trusted keys.

The hosted endpoint is `https://3lgrouptechnology.com/mcp` over streamable HTTP. Your `lms_...` key goes in as the `api_key` argument on each tool call, and the service shows it once. Keys begin at risk level L0 with a $50 monthly cap; reaching the cap stops sends rather than letting them overrun. A letter costs a $1.00 service fee plus postage, a fax the same $1.00 plus roughly $0.07 per page from Phaxio. Running the stack yourself? Without `POSTGRID_API_KEY` drafts fail at address verification, so nothing goes out.

## Requirements
- Remote server: `https://3lgrouptechnology.com/mcp`

## Install

### Claude Code (native platform)

**Platform CLI: remote server**
```bash
claude mcp add --transport http 3lt-letter-mail https://3lgrouptechnology.com/mcp
```

### Codex

**Platform CLI: remote server**
```bash
codex mcp add 3lt-letter-mail --url https://3lgrouptechnology.com/mcp
```

### Cursor

**Config file**
File `.cursor/mcp.json`:
```json
{
    "mcpServers": {
        "3lt-letter-mail": {
            "url": "https://3lgrouptechnology.com/mcp"
        }
    }
}
```

### GitHub Copilot

**Config file**
File `.vscode/mcp.json`:
```json
{
    "servers": {
        "3lt-letter-mail": {
            "type": "http",
            "url": "https://3lgrouptechnology.com/mcp"
        }
    }
}
```

### Gemini CLI

**Platform CLI: remote server**
```bash
gemini mcp add -t http 3lt-letter-mail https://3lgrouptechnology.com/mcp
```

## When to use it
- mail a USPS letter without leaving the chat
- see the price before anything is sent
- run a bulk mailing with a single standing approval
- deliver a fax to a real fax machine without owning one
- find out where a send request got stuck

## Example prompts
- Draft a letter from `client.pdf` and show me the quote
- Send that draft and check it with `send_status`
- Create a fax draft from `invoice.pdf` and count the pages

## Similar
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- [resume-cover-letter](https://affpapa.org/en/nevibecode/skills/resume-cover-letter.md) — skill · 1200 installs

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