{"methodology":"DNS-level inspection only. MAILTYPE does not connect to recipient SMTP servers, send email, or claim mailbox existence.","sources":[{"name":"DNS","purpose":"MX/TXT/A/AAAA/NS evidence","method":"system resolver with Google Public DNS-over-HTTPS fallback"},{"name":"disposable/disposable-email-domains","license":"MIT","purpose":"known disposable-domain evidence","update":"daily upstream"}],"standards":[{"name":"RFC 5321","purpose":"SMTP/MX semantics"},{"name":"RFC 7505","purpose":"Null MX — domain explicitly does not accept email"},{"name":"RFC 7208","purpose":"SPF"},{"name":"RFC 7489","purpose":"DMARC"},{"name":"RFC 8461","purpose":"MTA-STS"}],"honesty":"NO means positive negative evidence such as NXDOMAIN or Null MX. UNKNOWN is used when DNS evidence cannot substantiate YES or NO."}