[kmail2] [Bug 455190] New: Cannot view S/MIME encrypted mail with attachments properly without

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https://bugs.kde.org/show_bug.cgi?id=455190

            Bug ID: 455190
           Summary: Cannot view S/MIME encrypted mail with attachments
                    properly without
           Product: kmail2
           Version: 5.19.3
          Platform: Debian testing
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: UI
          Assignee: kdepim-bugs at kde.org
          Reporter: zocker.network at gmail.com
  Target Milestone: ---

Created attachment 149646
  --> https://bugs.kde.org/attachment.cgi?id=149646&action=edit
KMail output after opening the mail

SUMMARY
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***

STEPS TO REPRODUCE
1. Receive a S/MIME signed & encrypted mail (with attachments, encrypted mail
with attachments is ~20 KiB big, and probably sent from Microsoft Outlook)
2. Try to encrypt it

OBSERVED RESULT
KMail takes a few seconds "to verify the signature of the mail" after clicking
on "decrypt" (I disabled auto-decrypting due to various reasons), then the mail
content pops up (correctly, with no issues, but no attachments displayed in the
header) with a green background (meaning mail is authentic) for around 100 ms,
then the message preview window is completely blank (in the background color of
the theme). This stays for around 3 seconds, then the whole process seems to
repeat without user interaction. Trying to interact with KMail while the
preview window is empty for 3 seconds shows that the UI is freezing, e.g. if
then trying to switch to another mail first happens after KMail seems "finished
with hanging". After opening the mail, while watching the process repeating, it
outputs a few lines, but multiple repeating times, consecutive to what is
happening in the UI (view attached log file; the last few lines might be output
produced while switching to another mail, which is then displayed fine). Most
notably is the line:
org.kde.pim.mimetreeparser: unknown mimetype "application/x-pkcs7-mime"

Thunderbird with its integrated support for S/MIME has no problems opening the
same mail.

EXPECTED RESULT
KMail displays the mail and it's content properly without retrying anything.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian testing (Kernel: 5.17.0-1-amd64)
(available in About System)
KDE Plasma Version: 5.24.5
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION

I am not sure what causes this bug. This is the first & only mail so far, which
seems to be a problem to KMail. The multiple error messages KMail outputs to
stderr seems unique (at least no search engine I tried found anyone else with a
similar one).
I can share more diagnostic information about the mail but not disclosure the
mail itself.

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