GPG: Encrypt also Subject header on send
When a mail is with GPG encryption you can read the subject unencrypted in the mail source. I really can't believe i'm the first one to notice, but there is nothing to find about that.
What should happen:
The subject should by encrypted in the mail body like enigmail for thunderbird does it. Otherwise at least deactivate the subject entry so no one can accidentally send information unencrypted.
Evolution Version 3.38.1