Is the 3lgrouptechnology 3lt Letter Mail MCP server down?

mcp-registry/com.3lgrouptechnology/3lt-letter-mail · v4.1.3

healthy
Last checked 2026-10-24 14:13 UTC · handshake 605ms

As of 2026-10-24 14:13 UTC, the 3lgrouptechnology 3lt Letter Mail MCP server is up with a Glimind reliability score of 90/100 (grade A). Over the last 30 days it answered 99.9% of Glimind's liveness checks. It had 2 outages in 90 days, with a median recovery of 6 minutes.

uptime (30d checks)
99.9%
checks observed
3,561
outages (90d)
2
tools
7

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

Install 3lgrouptechnology 3lt Letter Mail MCP server

Add to Cursor Add to VS Code

Claude Code

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

Claude Desktop · Windsurf · Cline (mcpServers JSON)

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

Third-party server, listed as discovered. Review its source before installing.

Agent-readiness: B (85/100)

B (85/100): 0 error(s), 2 warning(s) across 7 tool(s); ~1,501 tokens of tool definitions.
Scores higher than 46% of 15,644 MCP servers Glimind has audited.
Its tool list costs an agent ~1,501 tokens per session — lighter than 60% of servers.
84 → 85 since 2026-10-17
no tool-poisoning patterns
Schemas100
Descriptions100
Safety hints0
Token cost100
Client compatibility100
Protocol100
Reliability100
Stability100

What to fix (2)

7 of 7 tool(s) carry no readOnlyHint/destructiveHint annotations.

Annotate read-only tools with {"readOnlyHint": true}. Agents and gateways can then run them without a confirmation prompt, and route around destructive ones. How to fix →

Tools: approve_fax, create_fax_draft, draft_letter, get_fax_status, request_send and 2 more

4 tool(s) look like they change state (create/send/delete/pay…) but declare no destructiveHint.

Set annotations {"readOnlyHint": false, "destructiveHint": true|false, "idempotentHint": …}. Clients use these to ask the user before a side effect and to auto-approve safe reads. How to fix →

Tools: approve_fax, create_fax_draft, request_send, send_fax

Auto-fix: 6 corrected tool definitions

Paste-ready definitions with the problems above fixed. Changes marked verify need a human look. All of them as JSON: /v1/readiness/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail/fixes

approve_fax 1 change 
{
  "name": "approve_fax",
  "description": "Approve a fax DRAFT so it can be transmitted. The content is\nre-screened at approval time. Only the key that created the fax can\napprove it. Nothing is transmitted by this call — send_fax does that.",
  "inputSchema": {
    "type": "object",
    "required": [
      "api_key",
      "fax_id"
    ],
    "properties": {
      "fax_id": {
        "type": "integer",
        "description": "the fax_id returned by create_fax_draft."
      },
      "api_key": {
        "type": "string",
        "description": "your 3L-Group Technology API key (lms_...)."
      }
    },
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": false,
    "destructiveHint": false,
    "idempotentHint": false
  },
  "title": "Approve Fax"
}
create_fax_draft 1 change 
{
  "name": "create_fax_draft",
  "description": "Create a fax DRAFT: validates the recipient number, counts the PDF's\npages, screens its text, and returns a price quote (Phaxio per-page\ncost x pages + the flat $1.00 service fee). This NEVER transmits\nanything — call approve_fax, then send_fax.",
  "inputSchema": {
    "type": "object",
    "required": [
      "api_key",
      "to_number",
      "pdf_path"
    ],
    "properties": {
      "api_key": {
        "type": "string",
        "description": "your 3L-Group Technology API key (lms_...)."
      },
      "pdf_path": {
        "type": "string",
        "description": "path to the PDF file on the server to fax."
      },
      "to_number": {
        "type": "string",
        "description": "recipient fax number — 10-digit US number or a full\nE.164 number starting with +."
      },
      "description": {
        "anyOf": [
          {
            "type": "string"
          },
          {
            "type": "null"
          }
        ],
        "default": null,
        "description": "optional label for your own records."
      }
    },
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": false,
    "destructiveHint": false,
    "idempotentHint": false
  },
  "title": "Create Fax Draft"
}
get_fax_status 1 change 
{
  "name": "get_fax_status",
  "description": "Check a fax: lifecycle status (DRAFT/APPROVED/SENT/FAILED), page\ncount, quote, and — once sent — the live delivery status from Phaxio.",
  "inputSchema": {
    "type": "object",
    "required": [
      "api_key",
      "fax_id"
    ],
    "properties": {
      "fax_id": {
        "type": "integer",
        "description": "the fax_id returned by create_fax_draft."
      },
      "api_key": {
        "type": "string",
        "description": "your 3L-Group Technology API key (lms_...)."
      }
    },
    "additionalProperties": false
  },
  "annotations": {
    "readOnlyHint": true
  },
  "title": "Get Fax Status"
}

Get alerted

Get an email or webhook when this server's readiness drops by 10+ points, tool-poisoning text appears, or a tool breaks:

curl -X POST https://glimind.com/v1/subscriptions -H 'content-type: application/json' -d '{"tools":["mcp-registry/com.3lgrouptechnology/3lt-letter-mail"],"email":"[email protected]"}'

Agents: watch_tool({"toolId": "mcp-registry/com.3lgrouptechnology/3lt-letter-mail"}) over MCP.

Passed

Largest tool definitions

Static checks of the advertised tools/list (schema, descriptions, annotations, tool-poisoning patterns, names, size) plus observed protocol, uptime, latency and contract changes. Read-only: no tool is ever called. Weights: schema 15, docs 20, safety 15, efficiency 15, compatibility 15, protocol 5, reliability 10, stability 5. Token counts are estimates (~3.6 characters per token).

Operator? Fix these, then re-check live. Embed the readiness badge:

Markdown 
[![MCP agent-readiness](https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail.svg)](https://glimind.com/server/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail?ref=badge)
HTML 
<a href="https://glimind.com/server/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail?ref=badge"><img src="https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail.svg" alt="MCP agent-readiness"></a>
reStructuredText 
.. image:: https://glimind.com/v1/readiness/badge/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail.svg
   :target: https://glimind.com/server/mcp-registry%2Fcom.3lgrouptechnology%2F3lt-letter-mail?ref=badge
   :alt: MCP agent-readiness

Tool-definition log

Glimind records every version of this server's tool definitions in a signed, append-only transparency log. Current manifest sha256:f5de134bf0bfea73…, first seen 2026-10-21, included at leaf 36914 of 59,240. Version history · verify what your client received.

Tools (7)

Compare: most reliable communication servers

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Add to Cursor Add to VS Code

Claude Code

claude mcp add --transport http glimind https://glimind.com/mcp

Claude Desktop · Windsurf · Cline (mcpServers JSON)

{
  "mcpServers": {
    "glimind": {
      "type": "http",
      "url": "https://glimind.com/mcp"
    }
  }
}

FAQ

Is the 3lgrouptechnology 3lt Letter Mail MCP server down right now?

As of 2026-10-24 14:13 UTC, the 3lgrouptechnology 3lt Letter Mail MCP server is up with a Glimind reliability score of 90/100 (grade A). Over the last 30 days it answered 99.9% of Glimind's liveness checks. It had 2 outages in 90 days, with a median recovery of 6 minutes.

How many tools does 3lgrouptechnology 3lt Letter Mail MCP server provide?

3lgrouptechnology 3lt Letter Mail MCP server advertises 7 tools, including approve_fax, create_fax_draft, draft_letter, get_fax_status, request_send.

How do I install 3lgrouptechnology 3lt Letter Mail MCP server?

Point your MCP client at this streamable-http endpoint: https://3lgrouptechnology.com/mcp

Is the 3lgrouptechnology 3lt Letter Mail MCP server safe to connect to an AI agent?

Glimind scanned all 7 tool definitions for tool-poisoning patterns — hidden or invisible characters, instructions that override the model, concealment from the user, requests to read credential or MCP config files, conversation exfiltration and cross-tool shadowing — and found none. This checks what the server tells the model, not what its code does; review the source before granting access to sensitive data.

Operator of 3lgrouptechnology 3lt Letter Mail MCP server?

Status page: 90-day uptime, every outage and how long it lasted.

Claim this listing to get the Verified operator marker, a remediation checklist and owner analytics, or embed the live badge from any of the tool pages above. Maintainers: alerts, deploy attestation and monthly reports.

Status is an automated estimate from Glimind's liveness checks (handshake and tool listing only; no tool is ever called) and may lag or differ from your network. Glimind is not affiliated with this server or its operator. Operator? Request a correction or opt out at https://glimind.com/opt-out.

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