@fell @davidrevoy @monsieuricon also WHY should this be a problem for @linux / kernel.org to fix, @protonmail?
It's YOUR #Mailserver and YOUR Service not theirs.
Just don't fuck with customers' eMails FFS!
https://social.kernel.org/objects/b72e194b-401b-45ff-80e9-efebcb7f0ebd
To me this is entirely undesireable behaviour for any eMail-Provider but then again so is the entire proposition of not using real #E2EE and instead letting some 3rd party appliance/service handle it - regardless if #SEPsesam or @Tutanota or #ProtonMail or whatever.