postbox-tools

com.postboxservices/postbox-toolsVersion 0.2.0

Free email checks: 24 blacklists, spoofing grade, redirects, spam test, WHOIS, BIMI, AI readiness.

Status

Responds469 msNov 14, 2026, 14:10 UTCAnswered our handshake without sign-in.

Registry data may be out of date

We could not refresh it, so this page shows the last copy.

Last checked: Nov 14, 2026, 14:10 UTC
Latency: 469 ms
Remotes responding: 1 of 1
Sign-in: No sign-in
Hosting: Hosted outside the EU (detected)
Registry data as of: Nov 14, 2026, 21:12 UTC

Data from the official MCP Registry, checked by run.zero. How we check

Connect

Streamable HTTP

https://mcp.postboxservices.com/mcpResponds469 msNov 14, 2026, 14:10 UTC

No sign-in

Claude Code

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

Claude Desktop and claude.ai

1
2
3

Settings > Connectors > Add custom connector
Name: postbox-tools
Remote MCP server URL: https://mcp.postboxservices.com/mcp

Cursor

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

VS Code

code --add-mcp '{"name":"postbox-tools","type":"http","url":"https://mcp.postboxservices.com/mcp"}'

Built your own server? run.zero hosts MCP servers on European infrastructure.

Host your own MCP server on run.zero

Tools

10 tools

Tools of postbox-tools
	Description		Read-only	Idempotent	Open world
`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.	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.	No	Yes	Not declared	Yes
`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. Returns an A-F grade, per-crawler access and findings.	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. Returns an A-F grade, per-crawler access and findings.	No	Yes	Not declared	Yes
`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 policy (BIMI also needs DMARC at enforcement - use check_spoofability for that).	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 policy (BIMI also needs DMARC at enforcement - use check_spoofability for that).	No	Yes	Not declared	Yes
`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 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.	No	Yes	Not declared	Yes
`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.	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.	No	Yes	Not declared	Yes
`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.	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.	No	No	Not declared	No
`get_domain_age`Get a domain's registration date and age (young domains have weak sending reputation).	Get a domain's registration date and age (young domains have weak sending reputation).	No	Yes	Not declared	Yes
`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.	Fetch the score and breakdown of a mail test created with create_mailtest, once the user has sent their email to the disposable address.	No	Yes	Not declared	No
`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/	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/	No	Yes	Not declared	Yes
`whois_lookup`WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags.	WHOIS summary for a domain: registrar, created/updated/expires dates, nameservers, DNSSEC, status flags.	No	Yes	Not declared	Yes

Details

Registry status: Active
Published: Nov 5, 2026
Updated: Nov 5, 2026
Website: https://postboxservices.com/mcp/⁠ (opens in a new tab)
Repository: Not given
Categories (suggested): CommunicationSuggested categories are assigned automatically from the registry text and may be wrong. Verified operators can correct them.
GDPR: Not declared

Are you the operator? Claim this listing