Is your domain set up safely?
One check of your email authentication, DNS, registration and web headers, graded A to F, with the exact fix for each problem.
Passive public lookups only (DNS, the registry's RDAP record and your home page's headers). Nothing you type is stored or logged.
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What this check does not cover
Use it from your code
The same check as an API: GET /check?domain= returns the grade, findings and fixes as JSON, POST /diff tells you what changed since your last snapshot (a moved MX or name server is flagged critical), and POST /batch checks several domains at once.
Daily monitoring (planned)
Get an email when a record changes or a domain is about to expire. Sign-up is not open yet; this form is switched off and collects nothing.