Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS.
| Endpoint | https://mcp.postboxservices.com/mcp (streamable-http) |
|---|---|
| Registry version | 0.1.1 |
| Now | 8 tools · grade A (95) · pin ts_8428807b37068b0ec156b5697b3d10be · protocol 2025-06-18 |
| First / last listed | 2026-10-25 06:05 UTC / 2026-10-25 06:05 UTC |
| Grade over time | 2026-10-25: A (95), 8 tools |
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Tools: check_blacklist check_spoofability trace_redirect create_mailtest get_mailtest_result analyze_eml get_domain_age whois_lookup
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. params: target* |
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. params: domain* |
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/ params: url* |
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. params: none |
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. params: id* |
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. params: eml* |
get_domain_age | Get a domain's registration date and age (young domains have weak sending reputation). params: domain* |
whois_lookup | WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags. params: domain* |
Entries describe changes in tool definitions. They are not statements about a server, its quality or its author. The grade measures how the tool definitions fit model providers (token cost, schema compatibility, confusable names) as scored by the ToolFit engine at the time of the listing. JSON: append .json. Opt-out: how or hello@youraitools.co.