# com.postboxservices/postbox-tools

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

- name: com.postboxservices/postbox-tools
- version: 0.1.1
- connection class: R0 (autonomous)
- trust: 83/100 flags: no-repository
- quality: 69/100 (needs work)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/com.postboxservices%2Fpostbox-tools
- tools: https://api.protogrid.dev/v1/servers/com.postboxservices%2Fpostbox-tools/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

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


## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 55
- drivers: +dns-namespace +website +reachable +uptime-100% +updated-24d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 69/100 (needs work)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-11-25; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 86 (weight 30)

- pass `tools.descriptions`: every tool has a description
- pass `tools.description_length`: descriptions are concise
- pass `tools.schemas`: every tool has an object input schema
- pass `tools.annotations`: 8 of 8 tools declare readOnlyHint or destructiveHint
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: check_blacklist (destructiveHint, idempotentHint, openWorldHint); check_spoofability (destructiveHint, idempotentHint, openWorldHint); trace_redirect (destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 1,010 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 25 (weight 15)

- warn `stability.changes`: 10 tool changes in 30 days
- fail `stability.rug_pull`: 2 tools kept their name but changed most of their description in 30 days; review before trusting them

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 8, about 1,010 tokens to load them all
- tool set hash: ec7df74e7a050603f335955332c039d4
- tools last changed: 2026-09-28T07:37:37.388Z
- badge: [![protogrid quality](https://protogrid.dev/badge/com.postboxservices/postbox-tools.svg)](https://protogrid.dev/servers/com.postboxservices/postbox-tools)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-09-28 `whois_lookup` changed (description, annotations)
  - before: WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags. Free tool by Postbox Services.
  - after: WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags.
- 2026-09-28 `get_domain_age` changed (description, annotations)
  - before: Get a domain's registration date and age (young domains have weak sending reputation). Free tool by Postbox Services.
  - after: Get a domain's registration date and age (young domains have weak sending reputation).
- 2026-09-28 `analyze_eml` changed (description, annotations)
  - before: 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. Free tool by Postbox Services.
  - after: 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.
- 2026-09-28 `get_mailtest_result` changed (annotations)
- 2026-09-28 `create_mailtest` changed (description, annotations)
  - before: 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. Free tool by Postbox Services.
  - after: 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.
- 2026-09-28 `trace_redirect` changed (description, annotations)
  - before: 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). Free tool by Postbox Services.
  - after: 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/
- 2026-09-28 `check_spoofability` changed (description, annotations)
  - before: 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. Free tool by Postbox Services.
  - after: 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.
- 2026-09-28 `check_blacklist` changed (description, annotations)
  - before: 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. Free tool by Postbox Services.
  - after: 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.
- 2026-09-27 `check_blacklist` changed (description) **meaning changed**
  - before: Check an IP address against 24 IP blacklists (Spamhaus ZEN, Barracuda, SpamCop and more), OR check a domain against the domain blacklists (Spamhaus DBL etc). A domain check tests the DOMAIN itself only - to check a specific sending IP, pass that IP. Free tool by Postbox Services.
  - after: 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. Free tool by Postbox Services.
- 2026-09-27 `check_blacklist` changed (title, description, inputSchema) **meaning changed**
  - before: Check a domain (its mail-relevant IPs) or a single IP address against 24 DNS blacklists including Spamhaus ZEN, Barracuda and SpamCop. Returns per-IP listing status. Free tool by Postbox Services.
  - after: Check an IP address against 24 IP blacklists (Spamhaus ZEN, Barracuda, SpamCop and more), OR check a domain against the domain blacklists (Spamhaus DBL etc). A domain check tests the DOMAIN itself only - to check a specific sending IP, pass that IP. Free tool by Postbox Services.

Full history: https://api.protogrid.dev/v1/servers/com.postboxservices%2Fpostbox-tools/changes

## Remotes

- https://mcp.postboxservices.com/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (8)

- `analyze_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.
- `check_blacklist`: 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.
- `check_spoofability`: 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.
- `create_mailtest`: 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_domain_age`: Get a domain's registration date and age (young domains have weak sending reputation).
- `get_mailtest_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.
- `trace_redirect`: 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/
- `whois_lookup`: WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags.