Eh, I never had much success with at least corporate whois email addresses even before they started being effectively removed (by registrars masking them, years

Eh, I never had much success with at least corporate whois email addresses even before they started being effectively removed (by registrars masking them, years before GDPR). Even addresses like postmaster@ which are mandated by the SMTP spec (RFC 5321 §4.5.1 and other places) don’t tend to work.