Free email checks: 24 blacklists, spoofing/BEC grade, redirect tracing, email spam test, WHOIS.
Listed on
First seen 2 Oct 2026. One server, whatever directories list it: each directory listing keeps its own page and history.
1
Directories
Collected by InvokeRank
8
Tools
From an anonymous probe
-
ToolBench grade
Not graded by Arcade
-
GitHub stars
No repository data
Tools
| Tool | Description | Behaviour |
|---|---|---|
| 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. | Read-only |
| 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 |
| 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 |
| 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. | Changes data |
| get_domain_age | Get a domain's registration date and age (young domains have weak sending reputation). | Read-only |
| 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 |
| 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 |
| whois_lookup | WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags. | Read-only |
| Directory | Listing | Tier | First seen |
|---|---|---|---|
| Official MCP Registry | com.postboxservices/postbox-tools | - | 2 Oct 2026 |