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100
MCP live MCP 2025-11-25 streamable-http

com.postboxservices/postbox-tools

com.postboxservices/postbox-tools

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

Watch this dependency Share evidence report
Uptime
100.0%
5 direct probes · 30d
Response
1188ms
last probe
Tools
10
callable
Resources
0
readable
Prompts
0
available
Primary URL
https://mcp.postboxservices.com/mcp
Score: 100/100
Handshake verified by our own probe.
pass Answers the MCP handshake 50/50
The handshake and the list calls succeeded on the primary URL.
pass Lists tools, resources or prompts 30/30
10 tools, 0 resources, 0 prompts returned.
pass 3 or more catalogue items 10/10
10 items in total; 3 or more earns these points.
pass Describes itself 10/10
95 characters; more than 30 earns these points.

Tools · 10

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…

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.

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, m…

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…

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.

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 f…

get_domain_age

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

whois_lookup

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

check_bimi

Check a domain's BIMI setup: looks up the default._bimi TXT record, fetches the logo it points to (l=) and validates the SVG against the BIMI SVG Tiny Portable/Secure profile, and reports whether a ce…

check_ai_discoverability

Grade how discoverable a website is to AI answer engines (ChatGPT search, Perplexity, Claude, Google AI Overviews, Copilot and others) from its public files: robots.txt access for each major AI crawle…

How to use

Claude Desktop or claude.ai: add a custom connector (Customize → Connectors; on Team and Enterprise plans an owner adds it under Organization settings → Connectors) with this server URL: https://mcp.postboxservices.com/mcp

Cursor or Cline: add to your MCP config:

{
  "mcpServers": {
    "com.postboxservices/postbox-tools": {
      "url": "https://mcp.postboxservices.com/mcp",
      "transport": "streamable-http"
    }
  }
}