All servers · Email & messaging · Cloud & networking · Security

com.postboxservices/postbox-tools

com.postboxservices/postbox-tools · v0.1.1

Measured by MCP Station

Last check	Reachable
Checked at	—
Check success 7 / 30 days	—
First-try success 30 days	—
Median response	—
Lookups 30 days	—
Authentication	No auth
MCP version	2025-06-18
Rank score	—
Declared risk	Can write (some tools are not declared read-only)
Capabilities declared	tools
Tool definitions	8 tools · with description 100% · input schema is an object 100% · read/destructive hints 100%

Description written by the publisher, not verified

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

Connect

streamable-http · https://mcp.postboxservices.com/mcp

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

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

Tools as reported by the server

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.
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
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
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 file - for the authoritative score use create_mailtest instead.
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.

Website · JSON · Text for agents · Registry updated 2026-09-26