3L-Group Technology MCP server

Which servers in the official MCP registry are 3L-Group Technology's own, whether they answer, and what they offer. A program checked each of these, nobody copied them from a product page.

read 2026-10-14

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Whose server it is

Registry namecom.3lgrouptechnology/3lt-letter-mailverified in the MCP registry

The registry name sits under 3lgrouptechnology.com. The registry only lets a publisher use that namespace after proving control of the domain through DNS or HTTP.

When we asked itchecked 2026-10-14

Stateanswerschecked 2026-10-14
Tools3
Server calls itself3l-group-technology-letter-mail
Server version4.0.10
Protocol version2025-06-18

On 2026-10-14 the server answered initialize and tools/list without a sign-in. First answer in 181 ms.

Tools it offers3 tools · read 2026-10-14

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)…
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…
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).

How to connect

Add the server to your MCP client config. Claude Desktop, Cursor and most other clients read this shape:

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

Each line is something a program found when it went looking: the registry entry, the server's own answer, a spec that parses. A missing line means we did not find it, not that it does not exist.