MCP server

3LT Letter Mail

com.3lgrouptechnology/3lt-letter-mail

Checked 28 Oct 2026, 09:03 UTC · Connected to it and listed its tools

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

Source

At a glance

Type

MCP server

Publisher

3lgrouptechnology.com (verified by the MCP Registry)

Status

Working at last check

Tools

7

Token cost

About 1,545 tokens per request

Sets up in

Claude Code, Claude Desktop, Codex, Gemini CLI, Cursor, VS Code, Antigravity, ChatGPT, OpenAI API, Grok

Last checked

28 Oct 2026, 09:03 UTC

Connect it to your agent

Add to CursorAdd to VS CodeVS Code Insiders

Opens the app, which shows the server and asks you to confirm. For other apps, copy the setup below.

Claude Code

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

Claude Desktop

Settings → Connectors → Add custom connector, and paste the URL.

Codex (config.toml)

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

Gemini CLI

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

Cursor

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

VS Code

{"servers":{"3lt-letter-mail":{"type":"http","url":"https://3lgrouptechnology.com/mcp"}}}

Antigravity

agy mcp add 3lt-letter-mail https://3lgrouptechnology.com/mcp

ChatGPT

Settings → Apps & Connectors → Advanced settings: turn on Developer mode, then Create a connector and paste the URL. Which plans can do this varies.

OpenAI API (Responses tools)

{"type":"mcp","server_label":"3lt-letter-mail","server_url":"https://3lgrouptechnology.com/mcp","require_approval":"always"}

Grok (xAI API tools)

{"type":"mcp","server_label":"3lt-letter-mail","server_url":"https://3lgrouptechnology.com/mcp"}

Tools

• approve_fax ~149 tokens
  Approve a fax DRAFT so it can be transmitted. The content is re-screened at approval time. Only the key that created the fax can approve it. Nothing is transmitted by this call — send_fax does that.
• create_fax_draft ~243 tokens
  Create a fax DRAFT: validates the recipient number, counts the PDF's pages, screens its text, and returns a price quote (Phaxio per-page cost x pages + the flat $1.00 service fee). This NEVER transmits anything — call approve_fax, then send_fax.
• draft_letter ~553 tokens
  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 d
• get_fax_status ~132 tokens
  Check a fax: lifecycle status (DRAFT/APPROVED/SENT/FAILED), page count, quote, and — once sent — the live delivery status from Phaxio.
• request_send Sends messages · ~182 tokens
  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
• send_fax Sends messages · ~135 tokens
  Transmit an APPROVED fax via Phaxio. Refuses drafts that were never approved and faxes that were already sent — a fax can be transmitted exactly once.
• send_status ~151 tokens
  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).

Browse

• Stripe tools
• PDF tools
• Payments

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