Postly
REMOTE · POSTLY.DK
Send printed letters to Danish addresses: regular or registered mail, printed and posted for you.
Available components
Last scanned (11 hours ago)
Scores higher than 60% of remote servers
Reachable. Last reached 5 Nov 2026.
Category Documents and Files
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security89
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- Authorisation is enforced on tool calls, but the challenge carries no valid RFC 9728 metadata, so a client cannot discover where to get a token. See how to fix → View diagnostics → Fail
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability66
- AI-judged instruction clarity (good).Pass
- Tool/resource definitions use about 565 tokens (~80/item across 7 items; 7 tools + 0 resources), lean.Pass
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management3
- Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage81
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 44% of tool parameters carry a description.Partial
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- All 1 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.Pass
- An AI judge read all 8 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 5 Nov 26 +1
- Stability: unverified → 0.03 ▲ functional
- 4 Nov 26 72
First indexed and scored.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 5 Nov 2026 · Probed https://postly.dk/api/public/v1/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=postly.dk | CN=WE1,O=Google Trust Services,C=US | 13 Oct 2026 | 11 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | 9a644382259e4cc4135604cc12694351 |
| SANs: postly.dk | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of postly.dk. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| dk. | present | 16874 | 13 | Verified |
| postly.dk. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication Challenged, unverified
The endpoint asked for a token, but we could not retrieve and validate the RFC 9728 metadata that tells a client how to obtain one.
| Result | Challenged, unverified |
|---|---|
| Enforced | On tool calls |
| HTTP status | 200 |
WWW-Authenticate challenge Bearer realm="Postly API"
Bearer realm="Postly API"| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| content-security-policy | frame-ancestors 'none' |
| x-content-type-options | nosniff |
| x-frame-options | DENY |
| referrer-policy | strict-origin-when-cross-origin |
Protected resource metadata
| Retrieved | No |
|---|---|
| Problem | no_resource_metadata |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://postly.dk/api/public/v1/mcp | Verified | 200 | |
| http (plaintext) | http://postly.dk/api/public/v1/mcp | HTTPS enforced | 301 | https://postly.dk/api/public/v1/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
create_letter_order Bestil brev med betalingslink (uden API-nøgle) ~120
Opretter et fysisk tekstbrev i Danmark og returnerer et betalingslink. Brugeren skal selv åbne linket og betale; brevet sendes først, når betalingen er gennemført. Kræver ingen API-nøgle. Bekræft altid modtagerens adresse og prisen med brugeren først.
| Name | Type | Req | Description |
|---|---|---|---|
| customerEmail | string | – | Valgfri e-mail til kvittering. |
| letterType | string | yes | – |
| recipient | – | yes | – |
| sender | – | yes | – |
| text | string | yes | Brevets tekst. |
No output schema declared.
No examples provided.
get_balance Hent saldo ~31
Viser den forudbetalte saldo og kontostatus for den tilknyttede API-kunde.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_letter_status Hent brevstatus ~30
Viser status for et tidligere sendt brev ud fra dets id.
| Name | Type | Req | Description |
|---|---|---|---|
| id | string | yes | – |
No output schema declared.
No examples provided.
get_order_status Hent ordrestatus (uden API-nøgle) ~42
Viser status for en ordre oprettet med create_letter_order, fx om den er betalt eller afsendt.
| Name | Type | Req | Description |
|---|---|---|---|
| orderId | string | yes | – |
No output schema declared.
No examples provided.
get_pricing Hent priser ~25
Henter Postlys aktuelle priser for almindelige og rekommanderede breve.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
list_letters Vis breve ~39
Lister de seneste breve sendt af denne konto.
| Name | Type | Req | Description |
|---|---|---|---|
| limit | number | – | – |
| reference | string | – | Vis kun breve med denne reference. |
No output schema declared.
No examples provided.
send_letter Send brev ~179
Sender et fysisk brev i Danmark. Beløbet trækkes fra den forudbetalte saldo, og brevet kan ikke annulleres efter afsendelse.
| Name | Type | Req | Description |
|---|---|---|---|
| fileBase64 | string | – | PDF som base64. |
| fileName | string | – | – |
| idempotencyKey | string | – | Valgfri unik nøgle for denne afsendelse. Brug den samme nøgle, hvis kaldet gentages, så brevet ikke sendes to gange. |
| letterType | string | yes | – |
| recipient | – | yes | – |
| reference | string | – | Din egen reference, fx et ordrenummer. |
| sender | – | yes | – |
| testOutcome | string | – | Kun med testnøgle: hvordan testbrevet ender. |
| text | string | – | Brevets tekst. Udelades hvis der sendes en PDF. |
No output schema declared.
No examples provided.
How do I install the Postly MCP server?
Postly is a hosted endpoint at https://postly.dk/api/public/v1/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · postly.dk
claude mcp add --transport http gustavmakes-postly 'https://postly.dk/api/public/v1/mcp'
What is the Postly MCP server?
Postly is an MCP server listed in the public MCP registry as io.github.gustavmakes/postly. Send printed letters to Danish addresses: regular or registered mail, printed and posted for you. This page covers its hosted endpoint (https://postly.dk/api/public/v1/mcp).
Is the Postly MCP server safe to use?
Postly scores 73 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Postly MCP server expose?
Postly exposes 7 tools: get_pricing, get_balance, send_letter, get_letter_status, list_letters, and 2 more. Their descriptions and schemas cost roughly 466 tokens of context every time the server is loaded.
Does the Postly MCP server require authentication?
Yes. Postly asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.
Is the Postly MCP server still maintained?
Postly is still listed as active in the MCP registry. We last reached this channel on 5 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.