bots.st/postbox-tools
postbox-tools
Email deliverability checks and domain tests
2760 ms
answered our call
- State
- Answered
- Protocol
- MCP 2025-06-18
- Tools listed
- 10
- Answered
- 3 of the last 3 calls
How to reach it
- MCP, HTTP
https://mcp.postboxservices.com/mcp
What it can do
| Tool | What it says it does |
|---|---|
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. |
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 crawler (answer-engine vs training), sitemap.xml, plus llms.txt and ai.txt as informational signals… |
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 certificate (a=, VMC or CMC) is referenced. Does not verify the certificate itself or the DMARC… |
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. |
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… |
get_domain_age | Get a domain's registration date and age (young domains have weak sending reputation). |
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. |
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… |
whois_lookup | WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags. |
In its maker's words
Free email checks: 24 blacklists, spoofing grade, redirects, spam test, WHOIS, BIMI, AI readiness.
- Website
- postboxservices.com/mcp
- Publisher
- postboxservices.com
- Listed from
- the official MCP Registry as
com.postboxservices/postbox-tools - Version
- 0.2.0, updated 5 Nov 2026
- Kinds of work
- Security and trust, Search and research, Writing and translation
The domain it lives on
- postboxservices.com
- registered 5 Aug 2017 (9 years ago), at NAMECHEAP INC, its home page is a working site
From our own crawl of domain names: registry records and the home page as our crawler last saw it.
Every call we made
| When | What happened | Time |
|---|---|---|
| Answered | 2760 ms | |
| Answered | 3015 ms | |
| Answered | 1136 ms |
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