Postbox Tools

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com.postboxservices/postbox-toolsv0.1.1 Domain verified

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

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https://mcp.postboxservices.com/mcp

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Tool list from our last check. Connect live to refresh it.

analyze_eml Read-only

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.

emlstring, required

The complete raw email source (headers + body), as exported via "Show original" / "Download message"

Tools (8)

analyze_eml

read-only

Argument	Type	Description
eml*	string	The complete raw email source (headers + body), as exported via "Show original" / "Download message"

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "eml"
  ],
  "properties": {
    "eml": {
      "type": "string",
      "description": "The complete raw email source (headers + body), as exported via \"Show original\" / \"Download message\""
    }
  },
  "additionalProperties": false
}

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.

read-only

Argument	Type	Description
target*	string	IPv4 address (checked against IP blacklists) or domain (checked against domain blacklists)

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "target"
  ],
  "properties": {
    "target": {
      "type": "string",
      "description": "IPv4 address (checked against IP blacklists) or domain (checked against domain blacklists)"
    }
  },
  "additionalProperties": false
}

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.

read-only

Argument	Type	Description
domain*	string	Domain to grade, e.g. example.com

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "description": "Domain to grade, e.g. example.com"
    }
  },
  "additionalProperties": false
}

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.

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

get_domain_age

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

read-only

Argument	Type	Description
domain*	string	Domain, e.g. example.com

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "description": "Domain, e.g. example.com"
    }
  },
  "additionalProperties": false
}

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.

read-only

Argument	Type	Description
id*	string	The test id returned by create_mailtest

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "The test id returned by create_mailtest"
    }
  },
  "additionalProperties": false
}

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/

read-only

Argument	Type	Description
url*	string	Absolute http:// or https:// URL to trace

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "description": "Absolute http:// or https:// URL to trace"
    }
  },
  "additionalProperties": false
}

whois_lookup

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

read-only

Argument	Type	Description
domain*	string	Domain, e.g. example.com

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "domain"
  ],
  "properties": {
    "domain": {
      "type": "string",
      "description": "Domain, e.g. example.com"
    }
  },
  "additionalProperties": false
}