MCP server for interacting with your LINE Official Account
Nothing to run from here
3LT Letter Mail is installed from its publisher's own source and answers where it runs, so this marketplace is not in the path of a single call. There is no address here to send one to, and a panel that pretended otherwise would be showing you an answer we made up. Install it and call it from your own client — the Installation tab has the entry for each one.
3
tools declared
—
trust score
remote
at its publisher
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calls last 7d
What it does
Give AI assistants hands: send real USPS letters via MCP.
Quickstart
# 1 — add it to Claude Code
claude mcp add --scope user --transport http 3lt-letter-mail-mcp https://3lgrouptechnology.com/mcp
# 2 — ask your agent for something these tools do
# draft_letter, request_send, send_status
3LT Letter Mail costs nothing on mcprush: there is no plan to choose here, no cap to set and nothing mcprush can bill you for.
Publishernot claimed
3LAll 1 server
3lgrouptechnology1 server
1 category
Collected from a public index. Nobody has claimed this account, so nothing here was written by its author — claim it if it is yours.
Installation
Where are you running it?
Every route below installs the same thing and ends at the same approval screen. Nothing here runs on your machine and nothing runs on ours: this server answers at its publisher’s own address, and what you install is the connection straight to it.
Claude Codedeclared by this listing
This is a public server: it answers at its publisher’s own address and this marketplace is not in the path. Claude Code registers it in one command; --scope user makes it available in every project. The transport below is http, as the publisher's own manifest declares it.
claude mcp add --scope user --transport http 3lt-letter-mail-mcp https://3lgrouptechnology.com/mcpReconnect, or start a new session, and the tools appear in the model’s tool list.
Free on mcprush, and it answers at its publisher’s own address: this marketplace is not in the path, so there is no key of ours to hold and no card to add.
What it writes
One config entry pointing straight at the publisher’s own address — this marketplace is not in the path, and nothing from this listing executes on your machine.
What you approve
3 tools, with what each one reads, writes and reaches shown before you agree — the same list on every route above. Read the tool surface.
Tool surface
What the model actually sees. Descriptions are diffed on every release — see version history.
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.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| api_key | string | yes | your 3L-Group Technology API key (lms_...). |
| to | object | yes | recipient address dict with name, address_line1, address_city, address_state, address_zip (US). |
| from_address | object | yes | sender address dict, same shape as to. |
| html | no | letter body as an HTML string (use this OR pdf_path). | |
| pdf_path | no | server-local path to a PDF to mail instead of html. | |
| color | boolean | no | True for color printing, False for black & white. |
| quantity | integer | no | number of identical letters (10+ gets the bulk rate). |
| description | no | optional label for your own records. | |
| certified | boolean | no | OPT-IN ONLY — True for USPS Certified Mail with Electronic Receipt (tracked, signature on delivery). Defaults to False, which sends standard First Class mail. Only set True when the customer explicitl |
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.
| Parameter | Type | Required | Notes |
|---|---|---|---|
| api_key | string | yes | your 3L-Group Technology API key (lms_...). |
| draft_id | integer | yes | the draft_id returned by draft_letter. |
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).
| Parameter | Type | Required | Notes |
|---|---|---|---|
| api_key | string | yes | your 3L-Group Technology API key (lms_...). |
| request_id | integer | yes | the request_id returned by request_send. |
Free
$0 forever
- Every tool — any call limit is its publisher’s, not ours
- No card, and mcprush charges nothing for it
- Runs at its publisher’s own address — this marketplace is not in the path
- Nothing to cap, because mcprush bills nothing
What counts against your monthly calls
| Tool | Unit | Calls used | Out of the allowance |
|---|
Nothing here is billable: mcprush charges nothing to install 3LT Letter Mail or to call it, at any volume.
Call allowance · this installenforced at the gateway
Monthly allowance, in calls
—
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Alert at 80% · then the tool returns a normal MCP error
Used this month: —
—Grade not published
No rule-by-rule report on file for this release
Two independent axes, because powerful and malicious are different questions. The grade is threat only. The capability level is blast radius, and it is never a penalty on the grade — it is priced as one subtract-only term in the score, where you can see it.
This listing is an address its publisher runs, and you connect to it directly — this marketplace is not in the path. The scanner reads packages and public source, and an address is neither: the repository linked on this page is where this record was collected from, not a copy of what the address serves, so it is not graded in its place. So there is no grade — not a withheld one, an unmeasured one.
Release history
This is an address its publisher runs: which release it serves is theirs to choose, so there is nothing here to pin. The history below is for reading; the current release on file is 1.0.0.
1.0.0
undated
latestNo release note was published with this version.
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no reviews yet
Who can review
One review per account, from a signed-in account that does not publish this listing. Nothing else is asked — you can say what you think before you install it. Publishers can reply once per review, and a review can be edited or deleted by whoever wrote it.
Sign in to write one
Any signed-in account that does not publish 3LT Letter Mail can review it, once — before installing it or after. A review from an account that has installed it is marked as one.
No reviews yet
Nobody has reviewed this listing. The rating on the card is the mean of the reviews written here and nothing else, so there is no rating until somebody writes the first — which takes a signed-in account that does not publish it, and nothing else.