Per ThorsheimI vibecoded a DNS Email Security Checker: check a domain for DNSSEC, MX, PTR, DANE, SPF, DKIM, DMARC, BIMI, RLS-RPT, MTA-STS, CAA, RPKI & Security.txt, with WHOIS info on top, recommendations & explanations & examples.
https://github.com/thorsheim/Mailcheck
Also available online at https://passwordscon.org/mailcheck/
GitHub - thorsheim/Mailcheck: Standalone html that runs in your browser to check any domain: DNSSEC, MX, PTR, DANE, SPF, DKIM, DMARC, BIMI, TLS-RPT, MTA-STS, CAA, RPKI, Security.TXT and WHOIS info.
Standalone html that runs in your browser to check any domain: DNSSEC, MX, PTR, DANE, SPF, DKIM, DMARC, BIMI, TLS-RPT, MTA-STS, CAA, RPKI, Security.TXT and WHOIS info. - thorsheim/Mailcheck