Postbox Tools

Reliability

Status and outage history · Atom feed · Watch with other listings

How to connect

Add it to any MCP client that supports remote servers.

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

8 tools

• 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…

• 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…

• 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.

Security scan

Recent checks