[kmail2] [Bug 428431] New: support the "memory hole" spec to encrypt/decrypt mail headers

[m.eik michalke]

https://bugs.kde.org/show_bug.cgi?id=428431

            Bug ID: 428431
           Summary: support the "memory hole" spec to encrypt/decrypt mail
                    headers
           Product: kmail2
           Version: 5.13.3
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: crypto
          Assignee: kdepim-bugs at kde.org
          Reporter: bugs.kde.org at ad.gelduntergang.biz
  Target Milestone: ---

for a long time, thunderbird + enigmail offer a feature to move certain mail
headers to the encrypted mail body. that way, it was possible to hide
information like the mail subject (it's replaced by "..."). with current
versions of thunderbird 78, this feature became mandatory for OpenPGP encrypted
mails and cannot be disabled. this currently can create a mess in your inbox.


STEPS TO REPRODUCE
1. have someone send you an OpenPGP encrypted mail using thunderbird >= 78

OBSERVED RESULT
kmail shows the subject as "...". when the mail is decrypted, you find the
missing headers at the top of the mail body. in grouped folder view, all
messages sent by thunderbird users form one huge thread with subject "...", it
is literally impossible to quickly find mails or even a particular mail thread.

EXPECTED RESULT
kmail should be able to replace the hidden subject with the actual one. it
should also be able to keep the memory hole format in replies.

ADDITIONAL INFORMATION
i personally wouldn't want to use such a feature. but in order to be able to
communicate with people who are unable to disable it, kmail should support it
so that you can get human readable subject lines back.

here's the spec:
https://github.com/autocrypt/memoryhole/blob/master/specs/draft-memoryhole.md

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