@f4grx @pemensik You cannot fix emails. I'm sorry, but that's just not going to happen.
You either replace email or you give up entirely. There's too much political power in the hands of people that do not want anything solved.
PGP is downstream of that mess. People have tried for years to fix PGP. That's what Sequoia allegedly was going to be.
That still hasn't happened, because PGP implementations refuse to say "we only support the newest stuff, and only the features and use cases that need to exist".
Why was the \f flag even in GnuPG? That shouldn't be a feature. If you designed a CTF challenge with that feature the judges would tell you it's too obvious and stupid, and to go back to the drawing board.