Email deliverability check: MX, SPF, DKIM, DMARC, blacklists, MTA-STS, DNSSEC, BIMI. Graded, no key.
Scored across 9 tools
Each tool targets a distinct email/DNS subsystem (BIMI, DKIM, DMARC, SPF, MX, MTA-STS, DNSSEC, blacklists), so selection is unambiguous. check_domain is an intentional aggregate of the others and is clearly described as the full run with SMTP probing, so it reads as a convenience wrapper rather than a duplicate.
All nine tools follow the same check_<subject> snake_case pattern (check_spf, check_dkim, check_dmarc, check_mta_sts, etc.), which is fully predictable. The single aggregate check_domain fits the same convention.
Nine tools sit squarely in the well-scoped range, with one tool per major authentication/DNS concern plus one aggregate entry point. Nothing appears redundant or filler.
Coverage is broad for email deliverability: SPF, DKIM, DMARC, BIMI, MTA-STS/TLS-RPT, DNSSEC/DNS health, MX, and blocklists, with an aggregate grader. Minor gaps remain — no standalone TLS/STARTTLS or DANE/TLSA check outside the optional SMTP probe, and no result-retrieval/history operations — but core workflows are complete.
Check the domain BIMI record at default._bimi: the SVG logo URL, the VMC/CMC certificate, and the DMARC enforcement BIMI needs.
Inputs: domain (required). Returns: grade, score, checks, domain, +10 more
Check whether the domain and its mail server IPs are listed on the Spamhaus (ZEN, DBL, ZRD, AuthBL), SpamCop, GBUdb and PSBL blocklists.
Inputs: domain (required). Returns: grade, score, checks, domain, +10 more
Check DKIM signing keys for a domain. Without a selector, common provider selectors are probed. Pass an explicit selector to look up that exact key at selector._domainkey.
Inputs: domain (required), selector. Returns: grade, score, checks, domain, +10 more
Check the domain DMARC policy at _dmarc: presence, policy strength (none/quarantine/reject), and reporting.
Inputs: domain (required). Returns: grade, score, checks, domain, +10 more
Check DNSSEC validation and DNS health: delegation, nameserver count, SOA, and reverse DNS of the mail servers.
Inputs: domain (required). Returns: grade, score, checks, domain, +10 more
Run the full email and DNS deliverability check for a domain: MX, SPF, DKIM, DMARC, DNS health, provider detection, and blacklists. Returns a letter grade (A+ to F, where specific weaknesses cap the grade), a 0 to 100 score, and every individual check with its RFC reference. Set include_smtp to also run a live SMTP probe of the mail servers: the probe is non-blocking, so when smtp_status is "pending" or "running" call this tool again (poll_after_seconds hints how long to wait) until smtp_status is "complete" and the SMTP checks appear in checks.
Inputs: domain (required), include_smtp. Returns: grade, score, checks, domain, +10 more
Check the domain MTA-STS policy (_mta-sts TXT and the HTTPS policy file, mode and MX coverage) and its TLS-RPT reporting record.
Inputs: domain (required). Returns: grade, score, checks, domain, +10 more
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
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Email deliverability checks: SPF, DKIM, DMARC, BIMI, MTA-STS, blacklists, headers, spam words
Check any domain's email deliverability: MX, SPF, DKIM, DMARC, MTA-STS, TLS-RPT, BIMI, blacklists.
Free email checks: 24 blacklists, spoofing grade, redirects, spam test, WHOIS, BIMI, AI readiness.
Check SPF, DKIM, DMARC, blocklists, reverse DNS and email headers against Gmail/Yahoo sender rules.
Add one secure layer between your agents and this server.
