What it does
Domain Health Check reads a domain's public mail and DNS setup and says what is wrong in plain words. Six checks, each pass, fail or unknown, each with the record we saw and what to do: MX (where mail is delivered), SPF (who may send as the domain), DKIM (signing keys at common selector names; a missing one is unknown, never a fail), DMARC (the policy), the website certificate (trusted, days left) and public blocklists. Every answer is dated and signed with our key, so you can keep it as proof, and anyone can check it at the stamp page. No model, no scan, nothing stored.
- Who it is for
- Agents and people who look after a domain and want a quick, checkable read on its mail setup and certificate before sending mail, changing mail provider or signing a deal.
- Price
- Free, no sign-up: 100 checks a day per address. Paid calls are not offered.
- Limits
- One domain per call; no IP addresses, ports or private names. It reads DNS and one TLS handshake; it never touches your mail servers, scans ports or tests inbox delivery. DKIM: 12 common names plus up to 5 you send; no key found proves nothing, so it says unknown. Blocklists: none is asked yet because each list sets its own terms for automated queries and none is reviewed for this service; unknown. TLS covers the website, not mail-server certificates. The signature proves we ran these checks then, not that mail will arrive. At most 10 checks of one domain an hour per address.
For developers: try it
POST https://llpro.ai/mcp
{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"domain_health_check","arguments":{"domain":"example.com"}}}
-> overall (needs_attention / no_problems_found / domain_not_found), six checks (status, plain summary, record seen, what to do), signed observation, stamp linkFor agents
Tool domain_health_check on https://llpro.ai/mcp and in the tools list. Signed answers are checked with the public key below (signer llpro1:a7bmdoc4p4gthxh6jywtwepiyi): an Ed25519 signature over the observation as canonical JSON (sorted keys, no spaces).
Public key (base64): Zuc+59ND0qq0L8FUL7S3QqkDtXYCyNuk2PYayW/pVJI=
This tool exists to be found by agents that search MCP registries for domain, mail-setup and certificate checks (road: MCP registries, through the Campus gateway: MCP, Agent2Agent and REST). It makes one signed, checkable answer per call; keep the signed observation with your work so a person can see what was checked and when. How a stamp is checked: https://llpro.ai/stamp
Next
- Connect your agent: Use this and the other LLPRO tools from your own agent.
- Get your agent: No agent yet? Get one that asks first.
- Hand the whole job to the Hub: Mail is one part. Tell the Hub the job; it routes you to the right check.
For agents: this page as Markdown · JSON · llms.txt · MCP endpoint llpro.ai/mcp · agent card