# com.postboxservices/postbox-tools (remote · mcp.postboxservices.com)

Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS.

- Trust score: 79/100 (medium)
- Change this week: +10
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-03

## Components

- remote · `mcp.postboxservices.com`: 79/100 (this document), [markdown](https://verifymcp.io/servers/com-postboxservices-postbox-tools/mcp.md), [page](https://verifymcp.io/servers/com-postboxservices-postbox-tools/mcp)

## Channel facts

- Endpoint: `https://mcp.postboxservices.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.1`

## Trust breakdown

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. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-03.

- **Endpoint Security**: 83/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC is configured correctly; the domain's records validate against the full chain to the root.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 80/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 697 tokens (~87/item across 8 items; 8 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 8 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 9 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the com.postboxservices/postbox-tools MCP server?

com.postboxservices/postbox-tools is a hosted endpoint at https://mcp.postboxservices.com/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.

### Claude

```bash
claude mcp add --transport http com-postboxservices-postbox-tools 'https://mcp.postboxservices.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-postboxservices-postbox-tools": {
      "url": "https://mcp.postboxservices.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-postboxservices-postbox-tools": {
      "type": "http",
      "url": "https://mcp.postboxservices.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-postboxservices-postbox-tools]
url = "https://mcp.postboxservices.com/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "com-postboxservices-postbox-tools": {
      "type": "remote",
      "url": "https://mcp.postboxservices.com/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add com-postboxservices-postbox-tools --url 'https://mcp.postboxservices.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-postboxservices-postbox-tools:
    url: "https://mcp.postboxservices.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-postboxservices-postbox-tools": {
      "Transport": "http",
      "Url": "https://mcp.postboxservices.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-postboxservices-postbox-tools -t streamable-http -u 'https://mcp.postboxservices.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-postboxservices-postbox-tools": {
      "type": "http",
      "url": "https://mcp.postboxservices.com/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-03 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-01 (score 78, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-28 (score 77, +7)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-09-27 (score 70, +1)

- [security] Tool “check_blacklist” rewrote its description, which is the text the model reads
- [functional improvement] Stability: unverified → 0.03
- [functional] Server version: 0.1.0 → 0.1.1
- [cosmetic] “check_blacklist” reworded the description of “target”
- [cosmetic] Tool “check_blacklist” changed its title: Email blacklist check (24 DNSBLs) → Email blacklist check

### 2026-09-26 (score 69)

First indexed and scored.

## MCP tools (8)

### `check_blacklist` (~99 tokens)

Email blacklist check

Check a domain against domain blacklists (Spamhaus DBL, SURBL, URIBL and others), or an IP address against 24 IP blacklists including Spamhaus ZEN, Barracuda and SpamCop. Checks the exact target given: domains are not resolved to IPs. Returns per-list listing status.

Input parameters:

- `target` (string, required): IPv4 address (checked against IP blacklists) or domain (checked against domain blacklists)

### `check_spoofability` (~71 tokens)

Spoofing / BEC exposure check (A-F grade)

Grade how exposed a domain is to email spoofing and business email compromise, from its public DNS (SPF, DMARC policy strength, alignment, live lookalike domains). Returns an A-F grade with findings.

Input parameters:

- `domain` (string, required): Domain to grade, e.g. example.com

### `trace_redirect` (~104 tokens)

URL redirect chain tracer

Follow a URL server-side through every HTTP redirect hop to its real final destination - per-hop status, IP, TLS and timing, plus phishing/deliverability flags (cross-domain jumps, https downgrades, meta/JS redirects). Fetching is SSRF-hardened (private ranges blocked, HTTPS-only, per-hop validation); how it works: https://redirect.postboxservices.com/

Input parameters:

- `url` (string, required): Absolute http:// or https:// URL to trace

### `create_mailtest` (~84 tokens)

Start an email deliverability test

Create a disposable test address for a full email deliverability audit (score /10: SPF, DKIM, DMARC + alignment, blacklists, reverse DNS, SpamAssassin content, Gmail/Yahoo bulk-sender compliance). The USER must then send an email from the system they want to test to the returned address, after which get_mailtest_result returns the score.

### `get_mailtest_result` (~52 tokens)

Get an email deliverability test result

Fetch the score and breakdown of a mail test created with create_mailtest, once the user has sent their email to the disposable address.

Input parameters:

- `id` (string, required): The test id returned by create_mailtest

### `analyze_eml` (~95 tokens)

Analyze a raw email file (.eml)

Run a deliverability/content analysis on a raw RFC 822 email (.eml source: full headers + body). IMPORTANT LIMITS: with no live SMTP session, SPF, blacklist and reverse-DNS cannot be verified from a file - for the authoritative score use create_mailtest instead.

Input parameters:

- `eml` (string, required): The complete raw email source (headers + body), as exported via "Show original" / "Download message"

### `get_domain_age` (~39 tokens)

Domain age lookup

Get a domain's registration date and age (young domains have weak sending reputation).

Input parameters:

- `domain` (string, required): Domain, e.g. example.com

### `whois_lookup` (~48 tokens)

WHOIS lookup

WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags.

Input parameters:

- `domain` (string, required): Domain, e.g. example.com

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/com-postboxservices-postbox-tools/mcp#diagnostics

## Score history

- 2026-10-03: 79
- 2026-10-02: 78
- 2026-10-01: 78
- 2026-09-30: 77
- 2026-09-29: 77
- 2026-09-28: 77
- 2026-09-27: 70
- 2026-09-26: 69

## Common questions

### What is the com.postboxservices/postbox-tools MCP server?

com.postboxservices/postbox-tools is an MCP server listed in the public MCP registry as com.postboxservices/postbox-tools. Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS. This page covers its hosted endpoint (https://mcp.postboxservices.com/mcp).

### Is the com.postboxservices/postbox-tools MCP server safe to use?

com.postboxservices/postbox-tools scores 79 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 com.postboxservices/postbox-tools MCP server expose?

com.postboxservices/postbox-tools exposes 8 tools: check_blacklist, check_spoofability, trace_redirect, create_mailtest, get_mailtest_result, and 3 more. Their descriptions and schemas cost roughly 592 tokens of context every time the server is loaded.

### Does the com.postboxservices/postbox-tools MCP server require authentication?

No. We connected to com.postboxservices/postbox-tools without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the com.postboxservices/postbox-tools MCP server still maintained?

com.postboxservices/postbox-tools is still listed as active in the MCP registry. We last reached this channel on 3 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://mcp.postboxservices.com/mcp
- Website: https://postboxservices.com/mcp/
- Changelog RSS feed: https://verifymcp.io/servers/com-postboxservices-postbox-tools/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-postboxservices-postbox-tools/mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-postboxservices-postbox-tools/mcp